Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32J U L Y / A U G U S T 2 0 1 6 14 POTATO GROWER NDSU Potato Pathology Dr. Neil Gudmestad, NDSU Dr. Gary Secor, NDSU The potato pathology research team is conducting numerous trials throughout North Dakota and Minnesota in 2016. Many of these trials are in grower coop- erator fields to take advantage of local cultural practices and site specific dis- ease issues, but we also have field exper- iments at the NPPGA irrigated research site, the Grand Forks Research Farm and on one North Dakota experiment sta- tion research sites. A brief description of those trials follows. Inkster NPPGA irrigated research site: There are 16 potato disease field experiments directed at the management of six pota- to diseases. Seven trials are focused on the management of early blight using foliar fungicides and the management of fungicide resistance. We also have a field experiment evaluating chemical means to manage the above ground phase of black dot. We have seven seed treatment trials that are focused on the management of Rhizoctonia stem canker and Fusarium seed piece decay. As you are all probably aware, Fusarium resistance to fludiox- onil is prevalent in ND and MN so we are looking for fungicides that can man- age Fusarium and secondary bacterial decay. Finally, we are increasing potato geno- types so that we can screen them for pink rot, leak and fusarium susceptibili- ty after harvest. Grand Forks NPPGA farm: We have one demonstra- tion trial evaluating Syngenta insecti- cide programs for CPB control. Prosper North Dakota Agricultural Experiment Station: We have seven trials at this loca- tion. Five of these are for late blight con- trol or resistance. One trial is directed at screening varieties and germplasm for late blight susceptibility, one trial is evaluating some new fungicide chemistries for foliar late blight control, two trials for evaluating new Innate selections for late blight resistance. There is also one demonstration trial evaluating Syngenta programs for late blight control. In addition, there are two trials evaluating new methods for bacterial ring rot detection and screen- ing new U.S. and European varieties introduced into the USA for their ability to express BRR. Two other locations We have two other on-farm locations in which we are evaluating nearly 70 pota- to cultivars for their susceptibility to tobacco rattle virus and potato mop top virus. Both of these viruses cause tuber necrosis rendering the tubers unmar- ketable. However, a preliminary study funded by the NPPGA has determined that potato varieties vary widely in their expression of the tuber necrosis phase. Some varieties become infected with the viruses but do not express the disease. Data from these trials can be used by potato growers to reduce the economic impact of these two viruses that are increasing in importance throughout the USA. Park Rapids We have four field trials at this location, all located in grower fields. Three trials involve the development of effective strategies for Verticillium wilt manage- ment. One trial is directed at using microbials and in-furrow/chemigated compounds for control, and two other trials are evaluating further improve- ment of Verticillium wilt control using soil fumigation. We also have one trial evaluating new chemistries for the man- agement of pink rot. Perham We have a single trial at this location evaluating fungicides for white mold control and the timing of those fungi- cides. Becker There are two trials at this location. These were established in a grower’s field. One trial is directed at general blemish control in red potatoes, and the other at black dot blemish and rhizocto- nia control. USDA-ARS Dr. Darrin Haagenson, USDA-ARS The USDA Potato Research Worksite in East Grand Forks, Minnesota is partici- pating in the 2016 US Potato Board Snack Food Association Chip Trials where 16 entries are being evaluated in a replicated field trial at Hoople, ND (Oberg Farms). We are also evaluating 52 advanced clones representing 8 pub- lic breeding programs at Larimore, ND (Hoverson Farms). Processing quality will be compared against commercial checks and will be assessed throughout storage at standard temperature and durations in 2016-17. A third field trial is being conducted at Grand Forks (NPPGA Farm) in collaboration with Dr. Susie Thompson. This study is evaluat- ing natural plant defense compounds (glycoalkaloids) and colorado potato beetle feeding among 24 potato clones. This summer we are adding the capabil- ity to quantify total glycoalkaloid con-