1a.Objectives (from AD-416):
The overall objective of this proposal is to refine the current management strategies based on industry needs to reduce overall levels of PVY and prevent the continued spread of necrotic and recombinant strains.
1b.Approach (from AD-416):
Our overall objective in this proposal is to refine the current management strategies used by the certification agencies to reduce the initial virus inoculum planted in the field and those used by growers to reduce the spread of virus within the crop. Specifically, we will
1. Work with seed certification agencies to monitor PVY strains and develop new diagnostic and training tools to better identify and eliminate PVY from seed stocks.
"Specialty Crops Research Initiative"
2. Work with breeding programs to better recognize and screen for virus resistance and symptom expression.
3. Work with growers to develop cost effective virus control strategies for both minituber and conventional seed production that can be implemented on the farm.
The first year of national PVY trials using breeding lines from U.S. potato breeding programs were conducted in Idaho, New York, and Wisconsin. Results from New York and Idaho indicate that four breeding lines have a high level of resistance (0-5% PVY) to the three strains of PVY that predominate in the US. Wisconsin results have not yet been fully analyzed. Minitubers were collected for a repeat of this experiment with the same breeding lines in the summer of 2012, which has been planted and is being evaluated. Breeders have been notified and are preparing a new set of minitubers for the 2013 and 2014 plantings. These trials identify new sources of resistance to PVY in potato germplasm and also identify problematic breeding material that is highly susceptible to PVY and that could cost the industry money if released as a production cultivar.