1a.Objectives (from AD-416):
To evaluate potato varieties and advanced selections from State and Federal potato breeding programs response to late blight and to determine the stability of each variety/selection for resistance/susceptibility to late blight across diverse environments when exposed to varying isolates of Phytophthora infestans.Reduce the impact of late blight through the use of resistant varieties and reduced fungicide programs; Conduct late blight resistance phenotyping of advanced breeding lines and a breeding population for future use in genetic marker development.
1b.Approach (from AD-416):
Advanced breeding selections and newly released potato varieties from State and Federal potato breeding programs will be entered into these National Late Blight Germplasm Evaluation Trials. These, along with known late blight differentials and standard check varieties, will be grown in replicated trials at several locations and evaluated for disease reaction at weekly intervals following either the first occurrence of late blight or inoculation with Phytophthora infestans. Area-under-the-disease-progress-curve will be calculated and analyzed. Trials are conducted at several locations to maximize exposure to different growing environments and possible variations in the pathogen population. This allows the data to be subjected to stability analysis.
Twenty-three potato clones from six public potato breeding programs and two late blight resistant standard clones were evaluated in replicated field plots in Pennsylvania in 2013 for foliar late blight resistance. This research will benefit potato growers by providing information on the reaction of new potato varieties and advanced selections to late blight disease.