Annual/Termination Reports:

[12/14/2009] [07/21/2010]

Report Information

Participants

Essah, Sammuel - Colorado State University;
Frankel, Lee - President of United Potato Growers;
Davidson, Rob - Colorado State University;
Stushnoff, Cecil - Colorado State University;
Holm, David - Colorado State University;
Vanamala, Jairam - Colorado State University;
Delgado, Jorge - USDA ARS, Fort Collins, CO;
Slaughter, Janna - Agro Engineering, Alamosa, CO;
David, Nick - North Dakota State University/University of Minnesota;
Gudmestad, Neil - North Dakota State University;
Hatterman-Valenti, Harlene - North Dakota State University;
Munt, Lola - Colorado Potato Administrative Committee  Area I;
Kirk, Willie - Michigan State University;
Jayanty. Sastry - Colorado State University;
Wallner, Steve - Colorado State University;
Bussan, A.J. - University of Wisconsin;
Sommers, Lee - Colorado State University;
Pavlista, Alexander - University of Nebraska;
Franc, Gary - University of Wyoming;
Crowder, Bill - Agro Engineering, Alamosa, CO;
Bewick, Tom - USDA CSREES;
Rockey, Sheldon - SLV Grower, representing CPAC Area II;
Wallace, John - CSS Potato Farms

Brief Summary of Minutes

Call to order: Samuel Essah (chair) called the meeting to order at 1:00 p.m. on Thurs., March 5.

Introductions: Members present introduced themselves.

2008 minutes were read. Willie Kirk moved and Harlene Hatterman-Valenti seconded the motion to accept 2008 minutes.

Selection of officers and future meeting places: Chair for 2010 - Nick David, North Dakota State University/University of Minnesota; Secretary for 2010 - Carl Rosen, University of Minnesota Venue for 2010 meeting--TBD; Venue for 2011 meeting - University of Minnesota; Venue for 2012 meeting - University of Wisconsin.

As a result of grower input from the 2008 NCERA205 meeting, Dr. Neil Gudmestad (NDSU) gave a presentation on the Biology and Management of Black Dot in Potato. The following is a brief summary of his presentation.

Black Dot has three phases on potato: tuber blemish, foliar lesions, and wilt phase. No sexual stage in Colletotrichum coccodes. Jim Davis worked on black dot for 25 years and did demonstrate that it reduced potato yield. Plants co-infected with Colletotrichum and Verticillium die 2-3 weeks before plants infected with Colletotrichum or Verticillium alone. Metam sodium is not a viable control option because the sclerotia are resistant to fumigation. The difference between silver scurf and black dot tuber blemish stage is the line of demarcation between diseased and healthy tissue. The line is very distincted on silver scurf infected tubers and more diffuse on black dot infected tubers. Silver scurf infected tubers also become more dehydrated.
The foliar phase is occasionally observed in the Midwest. Acurvuli are visible in the middle of foliar lesions that are similar to Alternaria alternata or solani. The wilt phase can be confused with rhizoctonia. When a plant dies from Verticillium, it has the lone soldier look, and dies standing up. However, when the plant dies because of black dot and Verticillium, death happens so fast that the plant simply collapses. Because the crop dies so fast, the stolons don't come off the tuber and cause problems with the processors. Black dot also results in darker color fries. Colletotrichum coccodes has no sexual stage and survives as mycosclerotium. In summary, early infections that occur 7-21 days after emergence are important for the wilt stage in soils that have >70 propagules per gram of soil when soils have <1.5% OM. A single application of 9 oz/a. of QoI fungicides at 50-80% ground control is warranted.

Dr. Gary Franc (University of Wyoming) gave a presentation on fungicide resistance management. It is a population phenomenon and genetically based. He discussed how resistant strains are selected by sub-lethal doses of pesticides. Resistance comes about by a genetic change in the population. Fungicide applications at the beginning of disease onset are the most critical in reducing fungicide resistance. In summary, the most effective fungicides should be used when diseases are first observed.

Accomplishments

Action Items: <br /> Attract and facilitate greater grower and industry participation in the NCERA-211 meeting.<br /> <br /> <br /> Accomplishment: Activities of NCERA-205 were introduced to new members of the group.<br /> <br /> Summary and Wrap Up: The group discussed the need to continue collaborative efforts and procure funds through larger grants in the areas of fertility, disease, and post-harvest management for newly released varieties and advanced breeding clones.<br /> <br /> Adjourn: Meeting was adjourned at 12:00 p.m. on Friday, March 6, 2009. <br />

Publications

None.

Impact Statements

1. State and regional research/extension efforts are continually being implemented as a result of the communication between the scientific community and the grower/industry sector made possible via the NCERA-211 meeting.
2. Recent work by Kirk (Michigan) and David (Minnesota) have demonstrated that the newly emerging threat of Corky ringspot in the Upper Midwest can be controlled without fumigation.
3. Furthermore, ongoing collaborative efforts between breeders, pathologists, entomologists, soil scientists, geneticists, physiologists, agronomists, and potato specialists are utilized to develop cultivar specific management guidelines. These guidelines encompass fertility, insect, weed, disease, and post-harvest management.

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Report Information

Participants

Gilley, Jon - RD Offutt, jgilley@rdoffutt.com;
Gerner, Wade - JR Simplot, wade.gerner@simplot.com;
Essah, Samuel - Colorado State University, sessah@lamar.colostate.edu;
Everman, Wesley - Michigan State University, everman@msu.edu;
Rosen, Carl - University of Minnesota, crosen@umn.edu;
Gunnerson, Chuck - NPPGA, cgunnerson@nppga.org;
Horken, Michael - Minnesota Dept. Agriculture, michael.horken@state.mn.us;
Miller, Jeff - University of Minnesota, mille603@umn.edu;
Kromray, Kathy - Minnesota Dept. Agriculture, kathryn.kromray@state.mn.us;
MacRae, Ian - University of Minnesota, imacrae@umn.edu;
Frederick, Ralph - AMVAC, ralphf@amvac.net;
Pavlista, Alexander - University of Nebraska, apavlista@unl.edu;
Thompson, Susie - NDSU, asunta.thompson@ndsu.edu;
Pranke, Alan - Cavendish Farms, pranke.alan@cavendishfarms.com;
Hatterman-Valenti, Harlene - NDSU, h.hatterman.valenti@ndsu.edu;
Maatz, Duane - WPVGA, dmaatz@wisconsinpotatoes.com

Brief Summary of Minutes

See pages 1-2 (State Reports) of submitted minutes as well as attached material for CO State.

Accomplishments

See pages 2-5 of minutes (Round table discussion).<br />

Publications

None.<br />

Impact Statements

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