Three main areas of research define the focus of planned experiments.
A. Refine seed certification practices to minimize the level of PVY in seed stocks and to eliminate tuber necrotic strains from seed stocks.
1. Continued surveillance and assessment of the PVY strains affecting the major seed production regions of the US, and improved specificity and efficiency of plant and tuber testing methods. (Karasev, Gray)
2. Produce training manuals that will assist seed certification inspectors and growers to identify the various foliar and tuber symptoms induced by the various strains of PVY predominant in that region. (Nolte et al)
3. Develop cost-based risk assessment analysis of in-season field inspection verses post harvest testing methods to better monitor and determine PVY levels in seed lots. (McIntosh)
4. Evaluate an alternative for post harvest evaluation of PVY incidence and minituber production. (Charkowski, Gray)
B. Develop and characterize effective PVY resistance in potato cultivars.
1. Identify which of the North American cultivars are susceptible to potato tuber necrotic ringspot disease (PTNRD). (Whitworth, Charkowski, Gray)
2. Screen germplasm for resistance mechanisms other than immunity that could be useful in virus disease management. (Whitworth, Gray, Wenninger)
C. Develop cost effective virus control strategies that can be implemented on the seed-producing farm.
1. Reducing virus inoculum within and around the potato crop.
1.a. Minituber vs conventional seed production in the field – impact of virus disease on both systems. (Charkowski, Groves, Nolte, McIntosh)
1.b. The economics of planting PVY-infected seed. (Nolte, Groves, McIntosh)
1.c. Management of alternative PVY and aphid hosts. (Hutchinson, Wenninger)
2. Reducing the spread of the virus within the potato crop by limiting vector populations and transmission efficiency.
2.a. Transmission efficiency of the different strains of PVY. (Gray, Wenninger)
2.b. Surveillance and control of the soybean aphid to minimize late season spread of PVY (Groves, Gray, Wenninger)