<b>Members in attendance:</b><p>;
Abawi, George, (gsa1@cornell.edu) - Cornell University;
Becker, Ole, (obecker@ucr.edu) - University of California - Riverside;
Borneman, James, (james.borneman@ucr.edu) - University of California - Riverside;
Eastburn, Darin (eastburn@illinois.edu) - University of Illinois;
Everts, Kathryne, (keverts@umd.edu) - University of Maryland;
Hao, Jianjun, (haojianj@msu.edu) - Michigan State University;
Kahn, Michael (AA), (kahn@wsu.edu) - Washington State University;
Parke, Jennifer (jennifer.parke@oregonstate.edu) - Oregon State University;
Pierson, Elizabeth (eapierson@tamu.edu) - Texas Agrilife Research;
Ploeg, Antoon, (antoon.ploeg@ucr.edu) - University of California - Riverside;
Stanghellini, Michael (michael.stanghellini@ucr.edu) - University of California - Riverside;
Yuen, Gary, (gyuen@unl.edu) - University of Nebraska<p>;
<b>Guests:</b><p>;
Fumiaki Funahashi - Oregon State University;
M. Hamadi - University of California - Riverside
Objective 1. To identify and characterize new biological agents, naturally suppressive soils, cultural practices, and organic amendments that provide control of diseases caused by soilborne plant pathogens.
CA-R- In a Southern California survey for sugar beet suppressive soils, only two of about 50 agricultural field soil samples showed significant suppressiveness against
H. schachtii.
CA-R- A sterile nematophagous fungus (ARF) with biocontrol activity against cyst nematodes and morphology resembling
D. oviparasitica was the subject of a series of investigations at the University of Arkansas starting in the 1990s. Our analysis of the 5.8S rRNA gene from ARF indicated that the strain is indeed closely related to
D. oviparasitica strain 50. Preliminary data from a survey of sugar beet fields in Southern California indicate that related fungi might be more abundant than previously thought.
CA-R- We investigated effects of soil pH on damping-off of sugar beet by the soilborne fungus
R. solani (AG2-2). Soil suppressiveness against the disease were studied by comparing disease incidence in pasteurized and non-pasteurized infested soils. Indigenous disease suppressiveness through the activity of antagonistic soil microorganisms functioned well in alkaline soils, but less or not at all in acidic soils.
CA-R- We determined the relationships between the amounts of the fungus
Dactylella oviparasitica and the plant-parasitic nematode
Heterodera schachtii, toward the goal of developing a more effective tool for making sugar beet planting decisions.
CA-R- We performed a high-throughput sequencing analysis of rRNA genes to identify bacteria associated with peach disease symptoms of peach. This worked identified a list of potentially causal agents.
CA-R We discovered a new endomycorrhizal fungus (molecularly identified as an Ascomycete) which is culturable, and, in preliminary studies, enhances growth of plants in the Brassicae family.
CA-R We determined that the tripartite host-specific interaction between
Olpidium bornovanus and
Monosporascus cannonballus is dependent upon near-saturated soil moisture conditions.
IL- A project to evaluate the effect of various fall planted cover crop treatments on diseases in subsequent soybean crops was initiated in the fall of 2010. Fall planted cover crop treatments included cereal rye, rape, canola, white mustard, and winter fallow. Plots were established at six locations in Illinois. At each location cover crops were planted in the fall of 2010 and 2011, with rye, rape, and fallow treatments at the on-farm locations; and all five treatments at the on-station locations. Soil samples were collected in the fall of 2010 (to establish baseline values), and again in the spring of 2011 and spring of 2012, shortly after planting the soybean crop, two to three weeks after incorporation of the cover crop debris. Sub-samples of the soils were taken and used for determining population levels of soybean cyst nematodes (SCN) and for DNA extraction. The DNA extracts are being used to determine population levels of selected soybean pathogens through QPCR and for ARISA analysis to establish microbial community profiles for each soil sample. The remainder of the soil sample for each plot is being used for greenhouse bioassays to evaluate the disease suppressiveness of the soils to selected soybean pathogens (
Fusarium virguliforme and
Rhizoctonia solani) for each cover crop treatment.
IL- At the on-station location in east-central Illinois, treatments also included pathogen infestation of sub-plots with
Fusarium virguliforme (the causal agent of sudden death syndrome of soybean) and
Rhizoctonia solani (the causal agent of Rhizoctonia seedling blight and root rot). In 2011, early season stand counts showed that seedling damping-off levels were extremely high in the
Rhizoctonia solani infested sub-plots of the fallow and mustard cover crop treatments, while damping-off levels in the rye cover crop plots were very low, similar to those in the non-infested plots. Damping-off levels in the canola and rape treatment plots were intermediate in severity between the fallow and rye treatment plots. In 2012, stand counts in the Rhizoctonia infested plots were not significantly different from the non-infested plots. However, lesion lengths of typical Rhizoctonia lesions on the hypocotyl/radical were longest on plants growing in the fallow plots and shortest on the plants growing in the rye plots. No significant differences were seen in levels of sudden death syndrome symptoms in the
Fusarium virguliforme infested sub-plots in either 2011 or 2012. Levels of soilborne-root diseases at the other locations were fairly low, and no differences associated with cover crop treatment were observed in 2011 or 2012.
MI- Research on potato-common-scab suppressive soil was continued. A bacterium
Bacillus amyloliquefaciens strain BAC03 isolated from this soil was studied for biological control on potato common scab. This strain has been patented and a progress is on going for commercialization. Field results showed that this product is effective in controlling potato common scab. This study has been published.
NM- In a greenhouse study, mustard seed meal was used at the rate of 0, 1000, or 2000 pounds per acre. Seed germination was similar in all treatments, although it was delayed for 3-5 days in soil treated with mustard seed meal. The highest percentage of chile plant survival was achieved in soil treated with mustard seed meal and covered with clear plastic for 3 weeks before planting.
NM- In a chamber study two microbial formulations, approved for organic production, were applied to soil as an aqueous solution (2 g/liter), one (Piranha) containing a combination of nine fungal species including mycorrhizae (
Trichoderma spp,
Glomus spp, and
Rhizopogon spp.) and two species of bacteria (
Pseudomonas spp.), and the other (Tarantula) containing a combination of bacteria including nine species of
Bacillus. Pots were infested with
Phytophthora capsici one week after sowing. None of the formulations prevented seedling infection and mortality by
P. capsici. However, using biorational products containing multiple microbial species is an ecologically sound approach in the control of soilborne pathogens, and necessitates further research.
NY- The development of our symbiotic multifunctional plant symbiotic Trichoderma strains took a major step forward in this past year. Sales of products based on these organisms have increased rapidly especially in the Midwest, on crops such as corn, soybeans and wheat. Their abilities to increase drought resistance was very much on display this past year. Even though the strains are applied as seed treatments, their abilities to colonize roots for the life of at least an annual crop was important. The increase in return on investment to corn growers is about 6:1 and is higher than that for wheat and soybean growers. In several hundred field trials over the past four years, the yield increase for corn is about 8.5 bushels. In the year of drought, the yield increase was about 10 bushels. The strains and products based upon them are now registered and available for sale in 11 other countries with 15 more where registrations are close to complete.
NY- Assessing the impact of selected cover crops on root health, soil health and crop productivity: This is a collaborative research and outreach project between NY, PA, and CT with funding support from the NE-IPM program. In New York, the final evaluation of the 9 cover crop treatments (rye grain + hairy vetch, oat, sudex, forage radish, red clover, rapeseed, buckwheat, wheat, and a fallow/control) that were established in four fields with different management histories in 2009 (total of 108 plots) was completed in 2012. Marketable yield of bean varied among the cover crop treatments and was influenced by the previous management strategies employed (four production systems tested) and also years. However, the lowest bean yields were generally in the buckwheat and the fallow check, whereas the highest yield fallowed primarily the rye/vetch, wheat, and oat. Weed pressure was least in the rye/vetch, wheat, and rapeseed plots, whereas weeds where the most severe in the fallow/check, buckwheat, and sudex plots. In addition, Buckwheat, clover and the fallow check appeared to increase root rot severity of beans in this evaluation. In contrast, the lowest accumulated increases in root rot severity over the duration of the study were in the wheat, sudex, oat, and radish plots. Many studies have shown that cover crops differ greatly in their suppression of various root pathogens as well as other soil management practices.
OR- Management of
Phytophthora spp. in recirculating irrigation water in nurseries: Nurseries often capture and reuse irrigation water, but this water can become a source of contamination by plant pathogenic oomycetes such as
Pythium and
Phytophthora spp. We investigated the viability and infectivity of
Phytophthora pini zoospores in a simulated recirculating irrigation water system. Results using a detached leaf assay demonstrated that zoospores which encysted during passage through a pressure-nozzle system were less capable of causing foliar lesions on rhododendon than were non-encysted zoospores. Encysted zoospores caused disease on only on wounded leaves, whereas non-encysted zoospores also infected non-wounded leaves.
WA- Taxa in Oxalobacteriaceae-
Massillia, Herbaspirillum, Duganella) and
Sphingobacteria- (
Chyseobacterium, Pedobacter, Chitinophagaceae) were associated with the rhizosphere of diseased plants inside of Rhizoctonia bare patches on wheat, in a field undergoing Rhizoctonia decline. Isolates of
Chyseobacterium were effective in controlling Rhizoctonia root rot of wheat in greenhouse tests with inoculated soil. These same groups were associated with wheat roots of plants grown in Rhizoctonia suppressive soils from 3 locations in Australia.
WA- A large collection of
Rhizoctonia was made from dryland wheat fields in eastern Washington, covering an area of 100s of square kilometers. This is the same area with high levels of phenazine producing
Pseudomonas. We tested the hypothesis that Rhizoctonia may have co-evolved with these strains, and developed resistance or tolerance to this antifungal compound. But there was no difference in sensitivity to phenazine between
Rhizoctonia strains collected from areas with high frequency of phenazine producers, compared to areas with a low frequency. For both
R. solani AG-8 and AG 2-1, the ED50 was around 10 ppm.
WA- Comparative genomics and bioinformatics are underway on eleven new strains of
Pseudomonas, originating from collaborator Chris Taylor, that control nematodes and fungal soilborne pathogens. Sequence data was obtained and assembled using Velvet by The Ohio State University, and annotated using a pipeline developed by the Chang group. Seven strains that have been provisionally annotated cluster with other biocontrol pseudomonad in the Pf-5, Pf01, SBW25 and NFM421 subclades, and each contain unique DNA.
Objective 2 To understand how microbial populations and their gene expression are regulated by the biological (plants and microbes) and physical environment and how they influence disease.
IL- DNA extracts from the cover crop treated soils was analyzed to quantify population levels of selected soybean pathogens to determine if the cover crop treatments directly suppress (or possibly increase) pathogen populations. Initial analysis of this data indicates that pathogen population levels were not significantly different as a result of the cover crop treatments. DNA extracts were also used develop microbial community profiles using the ARISA technique to determine if microbial populations shift as a result of the cover crop treatments. Differences in microbial populations were observed between the various locations of the study, but no differences were observed resulting from the cover crop treatments. The ARISA technique evaluates the overall microbial community structure. It is possible that changes in small sub-groups within the larger microbial community are changing in response to cover crop treatments, and that these are responsible for the disease suppressive effects observed.
MI- Compatibility of biocontrol agent
Coniothyrium minitans with fungicides, fertilizers, and herbicides were studied. This study was to provide information about the survival of
C. minitans in the field and the feasibility of tank mix. Biological control products, including chestnut tissues, and oregano essential oil,
Coniothyrium minitans (Contans, SipcamAdvan),
Streptomyces lydicus (Actinovate, SipcamAdvan), and
Trichoderma gamsii and
T. asperellum mixture (Tenet, SipcamAdvan), were studied for managing soybean white mold and potato common scab under greenhouse and field conditions in Michigan. Cover crops have been studied in the field to determine the effect of disease management, and soil microbial community is being analyzed in response to the effect.
NE- Previous research on
Lysobacter enzymogenes strain C3, a biocontrol agent of fungal and nematode plant pathogens, demonstrated production of HSAF (a family of macrocyclic lactams including dihydromaltophilin) to be an important biocontrol mechanism. HSAF biosynthetic genes in C3 were identified, as was a global regulatory gene
clp. A study was initiated in 2012 to identify additional genes involved in antimicrobial secondary metabolite production in the strain. Thirty seven putative genes with domains involved in two-component signal transduction systems were identified, and insertion or deletion mutants were constructed for each gene. Preliminary analysis of HSAF production using HPLC revealed 7 to be reduced in HSAF production compared to wildtype C3. In contrast, one mutant strain (1909) produced over 3-fold higher levels of HSAF than the wildtype in repeated experiments. The gene deleted in 1909 is homologous to
pilG which codes for a two-component system regulatory protein in strains of
Xanthomonas spp. and
Xyllela fastidiosa. PilG has been reported to up-regulate production of type 4 pilus (T4P) involved in gliding motility in other bacterial species. The involvement of the C3
pilG homolog in T4P production was supported by reduced gliding motility in mutant strain 1909. However, this is the first connection found between regulation of T4P and production of antimicrobial secondary metabolites.
OR- Regulation of microbial populations by plants, and how plants and microbes influence disease:
Striga, a genus of obligate parasitic weeds in the family Orobanchaceae, has been identified as the most important biological factor limiting agricultural productivity in sub-Saharan Africa. Germination of
Striga seeds is triggered by strigolactone root exudates from host plants. Strigolactones also induce hyphal branching in arbuscular mycorrhizal (AM) fungi, which are important for plant uptake of phosphorus in low phosphorus soils. Mechanisms of
Striga resistance based on reduced strigolactone production may also convey resistance to AM fungi which would require higher inputs of phosphorus fertilizer to attain optimal crop growth. There is evidence for genetic differences in mycorrhizal responsiveness in other grain crops; therefore it is beneficial for breeders to be aware of these differences when developing
Striga-resistant sorghum cultivars. We conducted research to determine phosphorus and mycorrhizal responsiveness of sorghum genotypes important for or developed by breeders working on
Striga resistance. Phosphorus response curves were determined for twelve sorghum genotypes using pasteurized low phosphorus soil amended to achieve four different phosphorus levels. Simple linear regression was performed on root and shoot dry weight data. Results indicate variability in phosphorus responsiveness within
Striga resistant and susceptible genotypes. Seven of these genotypes were selected for continued research, which analyzed responsiveness to phosphorous and differences in mycorrhizal responsiveness in relation to reported mechanisms of Striga resistance. All seven genotypes were responsive to mycorrhizae, with a significant increase in biomass for all genotypes, especially at the lowest phosphorus level. The responsiveness to the mycorrhizal fungus does not appear to be directly related to the susceptibility of genotypes to the parasitic weed
Striga.
Objective 3. To implement sustainable management strategies for soilborne pathogens that are biologically based and compatible with soil health management practices.
CA-R- Avicta seed coating provided consistent early season protection against root-knot nematodes in several carrot field trials during 2010-2012. The product's active ingredients are metabolites of Streptomyces avermitilis. Combination of Avicta with live biocontrol bacteria or fungi is possible as the a.i. has no known antimicrobial activity. In greenhouse tomato trials with M. incognita, the combination of Avicta with Pochonia chlamydosporia was superior to either treatment alone in reducing the nematode population (J2) and root galling as well as in increasing plant weight. Similar results were obtained in microplot trials with a Avicta/Pasteuria penetrans combination.
CA-R- Several botanical and microbial products were tested for purported nematicidal activity against root-knot nematodes. In an assay designed to detect egg parasitic activity against Meloidogyne incognita, MeloCon (Paecilomyces lilacinus 251) reduced the root-knot nematode population by approximately 30% at 23ÚC but had no effect at lower or higher temperatures. In tomato greenhouse trials MeloCon did not reduce juvenile population density or root gall disease. In field trials NemaQ, Actinovate, Sesamin EC, Dazitol, Ecozin Plus, and Nortica failed to show significant efficacy against M. incognita as indicated by root gall ratings after 8 weeks and 12 weeks (harvest).
OR- Soil solarization to manage soilborne Phytophthora spp.: In 2012 we conducted field trials in CA and OR to investigate the effectiveness of soil solarization and biocontrol, alone or together, in disinfesting soil containing inoculum of Phytophthora spp. Infested leaf inoculum of Phytophthora ramorum containing hyphae and chlamydospores was buried in a compacted soil. Soil temperature and moisture were continuously monitored. In the first trial, no P. ramorum was recovered from solarized plots after four weeks, where average soil temperatures were 36.9°C, 35.3°C, and 33.3°C, respectively. In contrast, P. ramorum was recovered from all three depths from the non-solarized plots where average temperatures were 27.6°C, 27.3°C, and 27.0°C at 5, 15, and 30 cm respectively. A subsequent trial in August-Sept., 2012 showed that as little as two weeks of solarization was effective in eliminating P. ramorum from the 5 cm and 15 cm depths, where the majority of P. ramorum is located in nurseries. After solarization, the biocontrol amendment Trichoderma asperellum TA1was added to half of each solarized and non-solarized plot. The results from the biocontrol amendment are still pending. We hypothesize that prior solarization of the soil will enhance the establishment of the biocontrol agent, which could provide sustained protection after the pathogen has been killed by solarization. Analysis of temperature parameters impacting pathogen survival, including the degree-hours above a certain temperature, is underway.
OR- A pilot solarization study was also conducted in two commercial nurseries in Oregon that were naturally infested with Phytophthora species. The commercial nurseries differed from the NORS-DUC site in that a several centimeter thick layer of rock or gravel, typical of a container yard, overlaid (and was partially embedded in) the soil. Soil/rock/gravel was sampled from 0-5 cm and from 5-10 cm below the surface before and after solarization which began in early September, and 4 wks after application of amendment with either Trichoderma asperellum TA1, SoilGard, or no amendment. The soil temperatures achieved in these commercial nurseries in Oregon were lower than those achieved at NORS-DUC; nevertheless, Phytophthora recovery was drastically reduced by solarization alone in one nursery, and by the combination of solarization and biocontrol in the other nursery. No plant pathogenic Phytophthora species were recovered in either nursery in solarized soil amended with either of the biocontrol treatments.
NY- Documenting the influence of soil health management strategies on root disease severity: The on-going, large-scale experiment (14 acres) conducted in collaboration with the Soil Health Program Work Team at Cornell was continued in 2012. The trial was established in 2003 at the long-term soil health site at the Gates Farm near Geneva, NY. The 18 treatments of the experiment include three tillage systems (no-till, strip-till, and conventional tillage), three cover crops (rye grain, hairy vetch, and no cover/fallow) and two rotations (one heavy with vegetables, whereas the other includes grain and forage crops and less vegetables. The 2012 results of the root rot severity assessment (soil bioassay with beans in the greenhouse) showed only small differences among the production treatments. However, the lowest root rot ratings were those of the plots with reduced tillage (strip-till and no-till) and the rotation with frequent grain and forage crops. In 2011, all the plots were planted to snap bean cv. Caprice (indexing crop planted every 3-4 years) to assess the accumulated effects of the tested treatments and their combinations. Results obtained showed that pod yield was highest in the ridge-till and in the zone-till plots and was lowest in the plow-till plots. In addition, it was difficult to machine harvest the plow-till plots due to excessive rainfall during the growing season, but there was no problem harvesting the reduced tillage plots and also the ridge-till plots. Root rot severity assessment in the field and in the greenhouse bean bioassay did not differ greatly among the various treatments, but it was again lower on roots of plants grown in the ridge-till plots.
WA- Rhizoctonia bare patch of onions is caused by R. solani AG-8, and is a major problem in irrigated circles in the Columbia Basin. The disease is exacerbated by a wheat cover crop that is planted for the fall and winter to hold the sand and keep it from blowing. The pathogen greenbridges from the dying cover crop to the newly seeded onion crop. We tested different timings of cover crop sprayout, and found significantly less disease when the wheat was sprayed out 17 or 27 days before planting, compared to 3 days before planting. This may be a useful tool in management of this disease.
Objective 4. Provide outreach, education, extension and technology transfer to our clients and stakeholders- growers, biocontrol industry, graduate and undergraduate students, K-12 students and other scientists.
IL- The Illinois cover crops project described above includes a significant outreach component that will be implemented in the third year of the project, once results have been obtained and analyzed. Descriptions of the project have already been distributed in the form of news releases and popular press articles.
MI- Results of the research were disseminated to soybean and potato growers, farm advisors, industry personnel and professional researchers at various meetings and conferences.
NE- Gary Yuen at University of Nebraska-Lincoln co-taught a distance-delivered course Biological Control of Pests that reached 58 graduate students located throughout the nation involved in plant health disciplines. Yuen also taught Introductory Plant Pathology to more than 70 undergraduate students, presenting biological control as a critical component of integrated disease management. In both courses, examples of research and implementation from W2147 members were used to illustrate these facets.
OR-Talks for growers: Parke gave invited talks to 100 growers and agricultural professionals at the UC Nursery and Floriculture Alliance: Nursery/Floriculture Disease Management Symposium in Watsonville, CA on the theory and practice of systems approaches, and on methods for disinfesting irrigation water. She also gave an invited talk on systems approaches for managing nursery diseases and pests at the NW Ag Show in Portland, OR sponsored by the Oregon Association of Nurseries (55 participants).
OR-Websites maintained
Forest Phytophthoras of the World www.ForestPhytophthoras.org
Plant pathogens in the genus Phytophthora threaten the biodiversity and sustainability of forest ecosystems worldwide. The overall aim of this website is to provide science-based information to aid in the understanding and management of the worlds forest Phytophthora species, all of which have a soilborne phase. While newly emerging, damaging species are the highest priority, information on other Phytophthoras is included in an attempt to gradually elucidate Phytophthoras diverse roles in terrestrial and aquatic ecosystems.
OR-Online Phytophthora Course: Training for Nursery Growers
http://oregonstate.edu/instruct/dce/phytophthora/index.html This free, online course is intended to inform nursery growers on ways to reduce their risk of Phytophthora disease in their nurseries. Available in both English and Spanish language versions, the course consists of three modules: biology and symptoms, disease management, and Phytophthora ramorum. The course is free, but there is an optional online exam which participants may take for $100. If they pass the test, they receive a Certificate of Mastery on Phytophthora from Oregon State University Extended Campus and are eligible for four credits of pesticide recertification credits through the Oregon Department of Agriculture.
OR-Journal edited
Forest Phytophthoras,, http://journals.oregondigital.org/ForestPhytophthora/issue/current is an open access, peer-reviewed, online journal. This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. Published articles are permanently archived with a unique digital object identifier (doi). Articles are available as html files and pdf files.
OR-Graduate student mentoring: Parke mentored five graduate students in 2012, including three who completed their M.S. theses in plant pathology or soil science. Parke served on three additional graduate student committees, including one at the Univ. of Florida.
OR-Technology transfer and policy development: Parke was invited to chair a national technical working group (TWG) of plant pathologists, entomologists, and horticulturalists by the APHIS Systems Approach Program Partnership. The TWGs charge was to evaluate plant production practices to enhance the ability of greenhouse and nursery operations to produce healthy plants. Specifically, the TWG identified practices and procedures that should be incorporated into a systems approach utilizing critical control points and associated best management practices to mitigate pests and pathogens. These BMPs will be used to identify standards that APHIS views as being important to greenhouse and nursery stock production and which may serve as a foundation for phytosanitary certification for use by harmonized state-based nursery certification programs. The output consisted of an unpublished document Matrix of minimum best management practices for producing healthy greenhouse and nursery plants delivered to APHIS in summer, 2012. This document is currently undergoing review by nursery and greenhouse stakeholders and the National Plant Board for possible adoption by APHIS.
NY- Sustainable management of root diseases and soil health: A number of participatory training workshops on the identification, assessment and management of soilborne plant pathogens in vegetable production systems were conducted by Abawi and Smart, in NY, PA, and MI.
NY- Undergraduate research experience. The Plant Pathology and Plant-Microbe Biology Department on the Geneva Campus of Cornell University established a summer scholars program to increase the involvement of undergraduate researchers in applied agricultural sciences. Smart is the director of this program for all 4 departments on the campus. In 2012, 28 students presented posters at the end of the program. Each summer, several students are involved with projects that are part of the W2147 multi-state project. During the summer of 2012, three students in the Smart lab were working on Phytophthora capsici detection in 1) irrigation water and 2) tomato plant rhizosphere samples and the third student worked on the population biology and evolution of the pathogen. Additionally, an undergraduate student in the Abawi lab worked on nematode problems in garlic.
NY- Outreach to K-12 students. We have continued our outreach program to third-grade students in the Geneva City School District (Geneva, NY). Part of this outreach includes a summer science camp, where students study different aspects of food production utilizing a garden that they plant at their school. One week of the 5-week program focuses on the importance of healthy soil to producing healthy vegetables.
Refereed Publications and Abstracts
Abawi, G. S., K. Moktan, C. Stewart, R. Hadad, and C. Hoepting. 2012. Current status of the bloat nematode on garlic in New York. Journal of Nematology 44: (in-press). Poster presented at the SON Annual meeting held in Savannah, GA during August 12 15, 2012.
Balaji, V. and Smart, C.D. 2012. Over-expression of snaking-2 and extension-like protein genes restricts pathogen invasiveness and enhances tolerance to Clavibacter michiganensis subsp. michiganensis in transgenic tomato (Solanum lycopersicum). Transgenic Research 21:23-37.
Becker, J.O., A. Ploeg, and J. Nunez 2012. Evaluation of novel products for root knot nematode management in tomato, 2011. Plant Disease Management Report No. 6:N016.
Cai, G., Restrept, S., Myers, K.L., Zuluaga, P., Danies, G. Smart, C.D. and Fry, W.E. 2013. Gene profiling in partially resistant and susceptible near-isogenic tomatoes in response to late blight in the field. Molecular Plant Pathology in press.
Dunn, A.R. and Smart, C.D. 2012. Monitoring changes in population structure of an isolated research population of Phytophthora capsici. Phytopathology 102:S4.32 (abstract).
Escobar, C., and Hao, J. 2012. Assessing biological control agents and their fungicide sensitivities for potential integrated management of Sclerotinia stem rot in soybean. Phytopathology 102:S5.4. (Abstract)
Fry, W.E., McGrath, M.T., Seaman, A., Zitter, T.A., McLeod, A., Danies, G., Small, I.M., Myers, K., Everts, K., Gevens, A.J., Gugino, B.K., Johnson, S.B., Judelson, H., Ristaino, J., Roberts, P., Secor, G., Seebold, K., Snover-Clift, K., Wyenandt, A., Grunwald, N.J., and Smart, C.D. 2013. The 2009 late blight pandemic in Eastern USA causes and results. Plant Disease in press.
Gachango, E., Hanson, L. E., Rojas, A., Hao, J. J., and Kirk, W. W. 2012. Fusarium spp. causing dry rot of seed potato tubers in Michigan and their sensitivity to fungicides. Plant Disease. Accepted.
Hao, J. J., Donis-Gonzalez, I. R., Jiang, H. H., and Fulbright, D. W. 2012. Antimicrobial activity in chestnut tissues corresponding with flavonol glycoside and terpenoid substances. The 5th International Chestnut Symposium. Shepherdstown, WV. Sep. 4 to 8. (abstract)
Jiang, H. H., Meng, Q., Hanson, L. E., and Hao, J. J. 2012. First report of Streptomyces stelliscabiei causing potato common scab in Michigan. Plant Disease 96:904.
Jones, L.A., Worobo, R.W. and Smart, C.D. 2012. Oomycete and bacterial pathogens in New York surface irrigation water: Survey results and ultraviolet treatment. Phytopathology 102:S4.60 (abstract).
Jones LA, Worobo RW, and Smart CD. 2012. Ultraviolet Treatment of Pathogens in Surface Irrigation Water. Abstracts of the Human Pathogens on Plants Workshop p17-18 (abstract).
Kim, S.-D., De La Fuente, L., Weller, D. M., and Thomashow, L. S. 2012. Colonizing ability of Pseudomonas fluorescens 2112, among collections of 2,4-diacetylphloroglucinol-producing Pseudomonas fluorescens spp. in pea rhizosphere. Journal of Microbiology and Biotechnology 22:763-770.
Kwak Y-S, Bonsall RF, Okubara PA, Paulitz TC, Thomashow LS, Weller DM (2012) Factors impacting the activity of 2,4-diacetylphloroglucinol-producing Pseudomonas fluorescens against take-all of wheat. Soil Biol Biochem 54: 48-56.
Lee, H., Ullrich, S. E., Burke, I. C., Yenish, J. and Paulitz, T. C. 2012. Interactions between the root pathogen Rhizoctonia solani AG-8 and acetolactate-synthase-inhibiting herbicides in barley. Pest Management Science 68 :845-852.
Lange, H.W. and Smart, C.D. 2012. Evaluating efficacy of black rot control caused by Xanthomonas campestris pv. campestris in greenhouse transplant production. Phytopathology 102:S4.66 (abstract)
Liebhold, A. M., Brockerhoff, E. G., Garrett, L. J., Parke, J. L., and Britton, K. O. 2012. Live plant imports: the major pathway for forest insect and pathogen invasions of the US. Frontiers in Ecology and the Environment 10: 135143. http://dx.doi.org/10.1890/110198
Loper JE, Hassan KA, Mavrodi DV, Davis EW, Lim CK, Shaffer BT, Elbourne LDH, Stockwell VO, Hartney SL, Breakwell K, Henkels MD, Tetu SG, Rangel LI, Kidarsa TA, Wilson NL, van Mortel JE, Song C, Blumhagen R, Radune D, Hostetler JB, Brinkac LM, Durkin SA, Kluepfel DA, Wechter PW, Anderson AJ, Kim YC, Pierson LS, Pierson EA, Lindow SE, Kobayashi DY, Raaijmakers JM, Weller DM, Thomashow LS, Allen AE, and Paulsen IT 2012. Comparative genomics of plant-associated Pseudomonas spp: insights into diversity and inheritance of traits involved in multitrophic interactions. PLoS Genetics 8: e1002784
Lu, X. H., Davis, R. Michael, Livingston, S., Nunez, J. J., Hao, J. J. 2012. Fungicide sensitivity of Pythium species associated with cavity spot of carrot in California and Michigan. Plant Disease 96:384-388.
Maketon C, Fortuna A-M, Okubara PA 2012. Cultivar-dependent transcript accumulation in wheat roots colonized by Pseudomonas fluorescens Q8r1-96 wild type and mutant strains. Biol Cont 60: 216-224.
Mastouri, F., T. Bjorkman and G. E. Harman, 2012. Trichoderma harzianum strain T22 enhances antioxidant defense of tomato seedlings and resistance to water deficit. Molec. Plant Microbe Interact. 25, 1264-1271.
Mavrodi DV, Mavrodi OV, Parejko JA, Bonsall RF, Kwak Y-S, Paulitz TC, Thomashow LS, and Weller DM 2012. Accumulation of the antibiotic phenazine-1-carboxylic acid in the rhizosphere of dryland cereals. Applied and Environmental Microbiology 78: 804-812
Mavrodi OV, Mavrodi DV, Parejko JA, Thomashow LS, and Weller DM 2012. Irrigation differentially impacts populations of indigenous antibiotic-producing Pseudomonas spp. in the rhizosphere of wheat. Applied and Environmental Microbiology 78: 3214-3220 highlighted in the June 2012 issue of Microbe magazine published by the American Society for Microbiology.
Mavrodi OV, Walter N, Elateek S, Taylor CG, Okubara PA 2012. Suppression of Rhizoctonia and Pythium root rot of wheat by new strains of Pseudomonas. Biol Cont 62: 93102
Mavrodi, D. V., Mavrodi, O. V., Parejko, J. A., Bonsall, R. F., Kwak, Y. S. Paulitz, T. C., Thomashow, L. S. and Weller, D. M. 2012. Accumulation of the antibiotic phenazine-1-carboxylic acid in the rhizosphere of dryland cereals. Applied and Environmental Microbiology 78: 804-812.
Meng, Q. Yin, J. F., Rosenzweig, N., Douches, D., and Hao, J. J. 2012. Culture-based assessment of microbial communities in soil suppressive to potato common scab. Plant Disease 96: 712-717.
Meng, Q., Jiang, H. H., Hanson, L. E., and Hao, J. J. 2012. Characterizing a novel strain of Bacillus amyloliquefaciens BAC03 for potential biological control application. Journal of Applied Microbiology. Journal of Applied Microbiology 113: 1165-1175.
Parejko JA, Mavrodi DV, Mavrodi OV, Weller DM, and Thomashow LS 2012. Population structure and diversity of phenazine-1-carboxylic acid producing fluorescent Pseudomonas spp. from dryland cereal fields of central Washington State (USA). Microbial Ecology 64: 226-241
Parke, J. L. and N. J. Grünwald. 2012. A systems approach for management of pests and pathogens of nursery crops. Plant Dis. 96:1236-1244. http://dx.doi.org/10.1094/PDIS-11-11-0986-FE
Paulitz, T. C., Cook, R. J., Campbell, K.G. and Poole, G. 2012. Fusarium crown rot research in the Pacific Northwest of the United States: A half a century of discoveries. Pg. 11. Proceedings of the First International Crown Rot Workshop for Wheat Improvement, Oct. 22-23, 2012. Narrabri, New South Wales, Australia.
Ploeg, A., J.O. Becker, and J. Nunez 2011. Integrated control of root-knot nematodes in California carrot. J. Nematology 43: 271. (abstract).
Pokharel, R. R., G. S. Abawi, and J. M. Duxbury. 2011. Greenhouse evaluation of rice and wheat germplasms for resistance to Meloidogyne graminicola with comments on evaluation indices and proposal of a new one. Nematologia Mediterranea 39: 157 168.
Poole, G. J., Erginbas, G., Smiley, R. W., Campbell, K. G. and Paulitz, T. C. 2012. Inoculation methods to assay wheat seedlings for resistance to Fusarium crown rot in a controlled environment. Pg. 39. Proceedings of the First International Crown Rot Workshop for Wheat Improvement, Oct. 22-23, 2012. Narrabri, New South Wales, Australia.
Poole, G. J., Smiley, R. W., Paulitz, T. C, and Campbell, K. G. 2012. Identifying QTL for Fusarium crown resistance (F. pseudograminearum) in field, terrace, and growthroom screen environments. Pg. 49. Proceedings of the First International Crown Rot Workshop for Wheat Improvement, Oct. 22-23, 2012. Narrabri, New South Wales, Australia.
Poole, G. J., Smiley, R. W., Paulitz, T. C., Walker, C. A., Carter, A. H., See, D. R. and Garland-Campbell, K. 2012. Identification of quantitative trait loci (QTL) for resistance to Fusarium crown rot (Fusarium pseudograminearum) in multiple assay environments in the Pacific Northwestern US. Theoretical and Applied Genetics 125: 91-107.
Poole, G. J., Smiley, R. W., Walker, C. A., Campbell, K. G., and Paulitz, T. C. 2012. Distribution of Fusarium spp. causing crown rot in the Pacific Northwest. Pg. 22. Proceedings of the First International Crown Rot Workshop for Wheat Improvement, Oct. 22-23, 2012. Narrabri, New South Wales, Australia.
Rosenzweig, N., Lu, X. H., Jiang, H., and Hao, J. 2012. Multigene analysis of Pythium species causing carrot cavity spot in California and Michigan. Phytopathology 102:S4.102. (abstract)
Rosenzweig, N., Tiedje, J., Quensen III, J. Meng, Q., and Hao, J. J. 2012. Microbial communities associated with potato common scab suppressive soil determined by pyrosequencing analyses. Plant Disease 96: 718-725. The Editors Pick.
Schroeder, K. L. and Paulitz, T. C. 2012. First Report of a Ceratobasidium sp. causing root rot on canola in Washington State. Plant Disease 96: 591.
Schroeder, K. L. and Paulitz, T. C. 2012. First report of root rot caused by Rhizoctonia solani AG-10 on canola in Washington State. Plant Disease 96: 584.
Smith Becker, J., J. Yang, J. Borneman, P. Timper, R.R. Riggs, and J.O. Becker 2011. Investigations into the relatedness of the nematophagous fungi Dactylella oviparasitica and ARF-L. J. Nematology 43: 228. (abstract)
Sanogo, S., and Ji, P. 2012. Integrated management of Phytophthora capsici on solanaceous and cucurbitaceous crops: current status, gaps in knowledge, and research needs. Canadian Journal of Plant Pathology 34: 479492.
Sanogo, S., Roth, B., Liess, L., and Grover, K. 2012. Effect of two soil inoculants on seed germination and infection of chile seedlings by Phytophthora capsici. Phytopathology 102:S6.12 (abstract)
Sanogo, S., and Schaub, T. 2012. Evidence of inhibitory volatiles of London rocket and flixweed against three soilborne pathogens of chile pepper. Phytopathology 102:S6.12 (abstract).
Summers, C.F., Smart, C.D., McSpadden Gardener, B.B., Everts, K.L., Dunn, A.R. and Park, S. 2012. The impact of mixed-species cover crops on rhizosphere pathogens of organically managed tomato crops in New York, Ohio, and Maryland. Phytopathology 102:S4.115 (abstract)
Tancos, M.A., Small, I.M., Fry, W.E., and Smart, C.D. 2012. Early detection of airborne inoculum from wind-disseminated oomycetes. Phytopathology 102:S4.118 (abstract)
Watanabe, K., M. Matsui, H. Honjo, J.O. Becker, and R. Fukui 2011. Effects of soil pH on Rhizoctonia damping-off of sugar beet and disease suppression induced by soil amendment with crop residues. Plant Soil 347:255-268.
Weerakoon, D. M. N., Reardon, C. L., Paulitz, T. C., Izzo, A. D. and Mazzola, M. 2012. Long-term suppression of Pythium abappressorium induced by Brassica juncea seed meal amendment is biologically mediated. Soil Biology and Biochemistry 51: 44-52.
Weller DM, Mavrodi DV, van Pelt JA, Pieterse CMJ, van Loon LC, and Bakker PAHM 2012. Induced systemic resistance in Arabidopsis thaliana against Pseudomonas syringae pv. tomato by 2,4-diacetylphloroglucinol-producing Pseudomonas fluorescens. Phytopathology 102: 403-412
Weller DM, Paulitz TC, Mavrodi DV, Mavrodi OV, Parejko JA, and Thomashow LS. Changing management practices and the environment: Impact on soilborne pathogens and biological control. pp 3-9 In: I Pertot, Y Elad, C Gessler, and A Cini (eds). Biological Control of Fungal and Bacterial Plant Pathogens. IOBC/WPRS Bulletin, Vol 78, Graz, Austria, 2012
Wen, L., G. L. Hartman, and D. M. Eastburn. 2012. Suppression of soybean diseases through the use of cover crops. Phytopathology 102:S4.134. (abstract)
Westphal, A., A. Pyrowolakis, R.A. Sikora, and J.O. Becker 2011. Occurrence of soil suppressiveness against Heterodera schachtii in California cropping areas. Nematropica 41:161-171.
Witte, H., A. Ploeg, S. Subbotin, I. DeLey, J. Smith Becker, and J.O. Becker 2011. Observations on a root-knot nematode in Coachella Valley turf. J. Nematology 43: 294. (abstract)
Wong, M-Y and Smart, C.D. 2012. A new application using a chromogenic assay in a plant pathogen DNA macroarray detection system. Plant Disease 96: 1365-1371.
Yang, J., S. Benecke, D.R. Jeske, F. Rocha, J. Smith-Becker, P. Timper, J.O. Becker, and J. Borneman 2012. Population dynamics of Dactylella oviparasitica and Heterodera schachtii: toward a decision model for sugar beet planting. Journal of Nematology 44:237-244.
Yang, JI, Loffredo, A., Borneman, J, Becker, JO. 2012. Biocontrol efficacy among strains of Pochonia chlamydosporia obtained from a root-knot nematode suppressive soil. Journal of Nematology 44:6771.
Yang, Jiue-in, Paul M. Ruegger, Michael V. McKenry, J. Ole Becker and James Borneman. 2012. Correlations between root-associated microorganisms and peach replant disease symptoms in a California soil. PLoS One 7:e46420.
Extension and Technical Publications
Abawi, G. S. and K. Moktan. 2012. Improve crop yield and get on your fields quicker with good soil management. Empire State Fruit and Vegetable Expo, Syracuse, NY. Proceedings, 3 pp.
Abawi, G. S. and K. Moktan. 2012. Vegetable disease control and the impact of soil health management practices. Empire State Fruit and Vegetable Expo, Syracuse, NY. Proceedings, 3 pp.
Abawi, G. S., C. Petzoldt, and K. Moktan. 2012. Practical ways to assess and manage soil health for disease control and improved yield. Great Lakes Expo, MSU Extension Proceedings, 3 pp, December 4 6, 2012; Grand Rapid, MI.
Becker, J.O. 2010. Carrot Seed Treated with Nematicides: A New Plant Protection Tool? Carrot County 18 (1):8-9.
Becker, J.O., A. Ploeg, and J. Nunez 2012. Evaluation of novel nematicides for management of root-knot nematodes. California Tomato Research Institute - 2011 Annual Report 105-110.
Becker, J.O., and A. Ploeg 2012. Evaluation of novel nematicides to mitigate root-knot nematode damage in carrot production. CA Fresh Carrot Advisory Board Annual Report 2011, pp. 7-14.
Dick, M. and Parke, J. 2012. Phytophthora kernoviae. Forest Phythophthoras 2: (in press)
Dunn, A.R. and Smart, C.D. 2012. Fungicide resistance found in Phytophthora blight isolates from Western New York. Veg Edge newsletter April 2012.
Dunn, A.R., Smart, C.D., Reiners, S. and Mazoruek, M. 2012. Comparing yield and disease incidence among Phytophthora tolerant sweet peppers. Proceedings of the 2012 New York Fruit and Vegetable Expo, Syracuse, NY. On-line at http://www.hort.cornell.edu/expo/proceedings.php
Griesbach, J.A., Parke, J. L., Chastagner, G.C., Grunwald, N.J., Aguirre, J. 2012. (2nd ed.) Safe procurement and production manual: a systems approach for the production of healthy nursery stock. 105 pp. Oregon Association of Nurseries, Wilsonville, OR. http://oan.org/associations/4440/files/pdf/SafeProduction.pdf
Hulbert, S., Guy, S., Pan, W., Paulitz, T. Schillinger, W. and Sowers, K. 2012. Camelina Production in the Dryland Pacific Northwest. Washington State University Extension Publication. FS073E. June, 2012.
Jones, L.A., Worobo, R. and Smart, C.D. 2012. Testing for pathogens in irrigation water. Proceedings of the Mid-Atlantic Fruit and Vegetable Convention.
Koening, R., Paulitz, T.C., Schroeder, K.L., Carter, A., Pumphrey, M., Huggins, D. and Campbell, K. 2011. Soil acidity and aluminum toxicity in the Palouse region of the Pacific Northwest. Washington State University Extension Publication. FS050E. October, 2011.
Lange, H.W., Smart, C.D., and Seaman, A.J. 2012. Evaluation of fungicides allowed for organic production on powdery mildew of zucchini, 2011. Plant Disease Management Reports (online) Report 6:V104.DOI:10.1094/PDMR06
Lange, H.W., Smart, C.D., and Seaman, A.J. 2012. Evaluation of fungicides allowed for organic production on downy mildew of cucumber, 2011. Plant Disease Management Reports (online) Report 6:V103.DOI:10.1094/PDMR06.
Lange, H.W., Smart, C.D., and Seaman, A.J. 2012. Evaluation of fungicides allowed for organic production on foliar diseases of tomato, 2011. Plant Disease Management Reports (online) Report 6:V105.DOI:10.1094/PDMR06.
Lange, H.W. and Smart, C.D. 2012. Evaluation of plant defense activators and bactericides for the control of black rot on cabbage, 2011. Plant Disease Management Reports (online) Report 6:V106.DOI:10.1094/PDMR06
Okubara P, Schroeder K, Paulitz, T, Chen W 2012. What lurks beneath, unraveling the mysteries of Rhizoctonia and Pythium. Wheat Life, November issue.
Okubara PA, Yan G, Smiley RW 2012. Molecular Diagnostics for Plant-Parasitic Nematodes in the Pacific Northwest. 2012 Dryland Field Day Abstracts, Technical Report 12-1, p. 34.
Parke, J. and Fisher, P. 2012. Treating irrigation water to eliminate water molds. Pages 5-47 through 5-49 in: Pacific Northwest Plant Disease Management Handbook (J. W. Pscheidt and C. M. Ocamb, eds.) A Pacific Northwest Extension Publication (Oregon State University, Washington State University, and University of Idaho). Online at: http://pnwhandbooks.org/plantdisease/pesticide-articles/treating-irrigation-water-eliminate-water-molds
Paulitz, T. C., Elling, A., Garland-Campbell, K. and Smiley, R. 2012. Rooting out the problems: Unseen nematodes take a visible bite out of profits. Wheat Life: July, 2012.
Ploeg, A., O. Becker, and J. Nunez 2010. Use of cruciferous cover crops and seed coating to manage root-knot nematode in carrot. 2009 California Fresh Carrot Advisory Board Annual Report. pp. 71-78.
Ploeg, A., O. Becker, and J. Nunez 2011. Use of cruciferous cover crops and seed coating to manage root-knot nematode in carrot. 2010 California Fresh Carrot Advisory Board Annual Report. pp. 93-99.
Ploeg, A., O. Becker, and J. Nunez 2012. Use of mustard seed meal and carrot seed coating to manage root-knot nematodes in carrot. 2011 Annual Report California Fresh Carrot Advisory Board. pp. 47-51.
Smart, C.D. and Hansen, Z. 2012. 2012 Trial of late blight resistance in tomato varieties. Veg Edge newsletter November 2012 reprinted in other newsletters.
Smart, C.D. 2012. Cultivating cole crops; Diseases of cole crops. Handout for Cultivating Cole Crops Workshop, and reprinted in newsletters (March 2012)
Smiley, R., Marshall, J. and Paulitz, T. 2012. Cereal Cyst Nematode Tolerance and Resistance in Spring Wheat. Grower publication- Oct. 9, 2012
Smiley, R., Paulitz, T. C. and Marshall, J. 2012. Controlling Root and Crown Diseases of Small Grain Cereals. Extension Bulletin PNW 639.
Extension and Outreach Presentations
Becker, J.O. Vegetable crop update meeting, UC West Side Research and Extension Center, Five Points, December 4, 2012. "Root-knot disease on vegetables and their causal agents." (invited hands-on demonstrations).
Becker, J. O. Vegetable crop update meeting, UC West Side Research and Extension Center, Five Points, December 4, 2012. "Biological, biorational and conventional nematicides: New tools for management of plant parasitic nematodes?" (invited presentation)
Becker, J. O. California Association of Pest Control Advisers Ventura Entomology Meeting, Santa Paula, CA, November 14, 2012. "New leads in plant parasitic nematode management and disease control". (invited presentation)
Becker, J. O .California Association of Pest Control Advisers Ventura Entomology Meeting, Santa Paula, CA, November 14, 2012. "Root-knot nematodes and their disease symptoms on various crops." (invited "show & tell" presentation)
Ploeg, A and Becker, J. O. Agrochemical Industry Nematology Training Session, UC South Coast Research and Extension Center, Irvine, CA, Oct. 24, 2012. "Research techniques for Greenhouse and Field Evaluations of Biological and Chemical Tools against Plant Parasitic Nematodes." (workshop with A. Ploeg)
Becker, J. O. Progressive Farmers Meeting/University of California Cooperative Extension, Blythe, CA, Oct. 18, 2012. "New tools for the management of plant parasitic nematodes." (invited presentation)
Becker, J. O. Botany & Plant Sciences Seminar BPS250 F2012, UC Riverside, October 17, 2012. Soils suppressive to plant parasitic nematodes (invited presentation)
Becker, J. O. Environmental Horticulture Meeting, Irvine, CA, Oct 3-4, 2012. "A root-knot nematode in Coachella turf: A wimpy pathogen?" (presentation)
Becker, J. O. Statewide CA Nematology Workgroup, Huntington Gardens, San Marino, CA, March 20. "Update on current research and outreach activities." (presentation)
Becker, J. O. Soilborne Pathogens Conference/CA Nematology Workshop, Huntington Gardens, March 20-22. "Novel nematicides in processing tomatoes." (presentation)
Becker, J. O. and Ploeg, A. Carrot Production Research Meeting, Bakersfield, March 8, 2012. "Evaluation of new nematicides in carrot production." (invited presentation)
Becker, J. O. Pesticide Applicators Professional Association Seminar, El Centro, February 16, 2012. "Root-knot nematodes in carrot production: Evaluation of novel IPM strategies." (invited presentation)
Becker, J. O. California Sugar Beet Industry Research Meeting, Holtville, CA, January 10, 2012. "Novel chemical, biorational and biological tools for plant parasitic nematode management." (invited presentation)
Becker, J. O. Turfgrass and Landscape Institute, Etiwanda Gardens, Rancho Cucamonga, CA, December 14, 2011. "Soil Amendments for Managing Plant Parasitic Nematodes: Theory and Practice." (invited presentation)
Escobar, C., and Hao, J. 2012. Assessing biological control agents and their fungicide sensitivities for potential integrated management of Sclerotinia stem rot in soybean. Wooster, OH, Jun. 13-14.
Hao, J. 2012. Report to Midwest Nut Producers Council Annual Meeting. Clarksville,
MI. Feb. 25.
Hao, J. 2012 Antimicrobial activity in chestnut tissues corresponding with flavonol glycoside and terpenoid substances. 5th International Chestnut Symposium, National Conservation Training Center, Shepherdstown, WV. Sep. 6, 2012.
Hao, J. 2012 Management of soilborne plant diseases. Beijing Plant Protection Station, Beijing, China, Jun. 5
Hao, J. 2012 Report to Michigan Potato Industry Commission Field Day. Montcalm, MI. Aug. 9.
Hao, J. 2012 Soil microbial community and soilborne diseases. China Agricultural University, Beijing, China, May 31.
Hao, J. 2012. Annual report to USDA W-2147 program (Managing Plant Microbe Interactions in Soil to Promote Sustainable Agriculture). Riverside, CA. Dec. 6.
Hao, J. 2012. Annual research report to Michigan Potato Industry Commission. East Lansing, MI. Jan. 12.
Hao, J. 2012. Annual research report to Michigan Soybean Promotion Committee. East Lansing, MI. Jan. 25.
Hao, J. 2012. Biological control agent BAC03 on controlling potato common scab. Nanjing Agricultural University, Nanjing, China, May 28.
Hao, J. 2012. Microbial community in soil suppressive to potato common scab. Chinese Academy of Institution and Quarantine, Beijing, China, Jun. 5
Hao, J. 2012. Report to Michigan Soybean Promotion Committee Field Day. East Lansing, MI. Aug. 18.
Hao, J. 2012. Soil microbial community analysis in soilborne disease management. Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, China, Jun. 6.
Hao, J. J., Donis-Gonzalez, I. R., Jiang, H. H., and Fulbright, D. W. 2012. Antimicrobial activity in chestnut tissues corresponding with flavonol glycoside and terpenoid substances. The 5th International Chestnut Symposium. Shepherdstown, WV. Sep. 4 to 8.
Okubara PA, Mavrodi O, Maketon C, Walter N, Aly H, Taylor CG 2012. Pseudomonas-based approaches for suppression of soilborne pathogens and pests. 2nd ISBioPEN Symposium Proceedings, Bangkok, Thailand, September 24-25, 2012.
Okubara, P. A. 2012. Wheat Root Defense Gene Induction by Biocontrol Pseudomonas fluorescens. American Phytopathological Society-Pacific Division, Sacramento, CA, June 29, 2012.
Okubara, P. A. Molecular Strategies for Controlling Necrotrophic Soilborne Pathogens of Wheat. Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, May 22, 2012.
Parke, J. A. Systems approach for management of nursery diseases and pests. NW Ag Show, Portland, OR. Jan. 26, 2012. 55 participants.
Parke, J. Biology and treatment of water molds in recycled irrigation water. University of California Nursery and Floriculture Alliance. Nursery/Floriculture Disease Management Symposium. Oct. 25, 2012. Watsonville, CA. 100 participants.
Parke. J. A. Systems approach for managing diseases of ornamentals: theory and practice. University of California Nursery and Floriculture Alliance. Nursery/Floriculture Disease Management Symposium. Oct. 25, 2012. Watsonville, CA. 100 participants.
Paulitz, T. C. 2012. Management of Root Diseases of Wheat Under No-Till Agriculture in the Pacific Northwest Rhizoctonia: A Case Study. Department of Agriculture and Food Western Australia, Perth, WA Australia Nov. 27, 2012.
Paulitz, T. C. 2012. Management of Root Diseases of Wheat Under No-Till Agriculture in the Pacific Northwest Rhizoctonia: A Case Study.. Nanjing Agriculture University and Huazhong Agriculture University in Wuhan, May 15-26.
Paulitz, T. C. 2012. Canola Diseases Oilseed Crop Production Workshop, Colfax, WA. Jan. 26, 2012
Paulitz, T. C. 2012. Management of Fresh Wheat Residue for Irrigated Winter Canola Production. Department of Ecology, Washington State, Ag Burning Task Force. Spokane, WA. Feb. 7, 2012.
Paulitz, T. C. 2012. The Role of Microbial Communities in the Natural Suppression of Rhizoctonia Bare Patch of Wheat in the USA and Australia. The 7th Australasian Soilborne Diseases Symposium, Freemantle, WA, Sept. 17-20, 2012
Paulitz, T. C. 2012. The Role of Microbial Communities in the Natural Suppression of Rhizoctonia Bare Patch of Wheat in the USA and Australia. CSIRO Floreat, Western Australia. Nov. 12, 2012
Paulitz, T. C. 2012. The Role of Microbial Communities in the Natural Suppression of Rhizoctonia Bare Patch of Wheat in the USA and Australia. CSIRO Canberra. ACT Nov. 21, 2012
Paulitz, T. C. 2012.The Role of Microbial Communities in the Natural Suppression of Rhizoctonia Bare Patch of Wheat in the USA and Australia. CSIRO Adelaide, South Australia Nov. 23, 2012.
Paulitz, T. C. Soilborne Pathogens in Wheat- Rhizoctonia and Cereal Cyst Nematode. Jan. 27, 2012, Walla Walla Growers, Walla Walla, WA
Paulitz, T.C. 2011. Nematodes: Symptoms and Management. Presented to the Asotin County Extension Grower Workshop, Clarkston, WA, Dec. 17, 2011.
Paulitz, T.C. 2011. Soilborne Pathogens in Wheat- Fusarium, Rhizoctonia, and Cereal Cyst Nematode. Nez Perce County Grower Workshop, Lewiston, ID, Oct. 18, 2011.
Paulitz, T.C. Root Disease Research at ARS Pullman-Whats New? Spokane Farm Forum, Ag Expo, Feb. 7, 2012
Ploeg, A and Becker, J. O. Agrochemical Industry Nematology Training Session, UC South Coast Research and Extension Center, Irvine, CA, Oct. 24, 2012. "Research techniques for Greenhouse and Field Evaluations of Biological and Chemical Tools against Plant Parasitic Nematodes." (workshop with A. Ploeg)
Rosenzweig, N., Lu, X. H., Jiang, H., and Hao, J. 2012. Multigene analysis of Pythium species causing carrot cavity spot in California and Michigan. APS Annual Meeting, Providence, RI, Aug. 4 8.
Schroeder, K. Canola Diseases. Far West Ag. Conference Dec. 11, 2012. Pasco, WA.
Schroeder, K. L. 2012. Rhizoctonia root rot of cereals: unraveling the disease complex. Commodity Classic, Nashville, TN. March 2, 2012.
Stanghellini, M. 2012. Biology and management of soil-borne root-infecting pathogens. AGRADIS, San Diego, California. July 31, 2012.
Stanghellini, M. 2012. Pythium brassicum: a novel family-specific root pathogen.
Soil Fungus Conference, March 21, 2012
Stanghellini, M. 2012. Update on ecology and biology of Monosporascus cannonballus Strokan-Hanes-McCaslin Foundation, June 24, 2012, San Marcos, California.
Weller, D. and Thomashow, L. 2012. Soil microbial changes with irrigation" WSU Lind Dryland Station Field Day, June, 14, 2012.
Witte, H. and Becker, J.O. Turf & Landscape Field Day, Agricultural Operations, UC Riverside, September 13, 2012. "Update on studies concerning Coachella Valley rot-knot nematodes." (invited presentation)
Websites maintained
Forest Phytophthoras of the World www.ForestPhytophthoras.org
Online Phytophthora Course: Training for Nursery Growers http://oregonstate.edu/instruct/dce/phytophthora/index.html
Graduate student theses supervised
Kandel, S. 2012. A survey of root lesion and cereal cyst nematodes in the dryland wheat production areas of Eastern Washington and resistance of Pacific Northwest wheat varieties. MSc thesis, Washington State University.
Leytem, A. B. Response of Striga-susceptible and Striga-resistant sorghum genotypes to soil phosphorus and colonization by an arbuscular mycorrhizal fungus. M.S. thesis, Oregon State University. 84 pp.
Shay, S. 2012. Viability and infective potential of Phytophthora pini zoospores in a recirculating irrigation system. M.S. thesis, Oregon State University. 85 pp.
Stamm, E.A. 2012. The effects of Phytophthora ramorum stem inoculation on aspects of tanoak physiology and xylem function in saplings and seedlings. M.S. thesis, Oregon State University. 80 pp.