Submitted to: Potato Conference and Trade Fair Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 2/5/1996
Publication Date: N/A
Interpretive Summary: This presentation was given to attendees at the 35th Annual Washington State Potato Conference in February, 1996. It explains the history of breeding for late blight resistance and describes what we are doing in the Tri-State Variety Development Program to produce late blight resistant varieties for the potato industry in the Pacific Northwest. Breeding selections AWN86514-2 and A90586-11 are described. Both have high foliar and tuber resistance to the new late blight strains. Progeny of AWN86514-2 were tested in Mexico and had a high frequency of resistance. This tells us that the kind of resistance that we are developing should be durable and not be overcome by the pathogen after a few years.
Technical Abstract: Two breeding selections from the USDA-ARS breeding program at Aberdeen Idaho have shown high levels of foliar and tuber resistance to late blight. AWN86514-2 has been tested in the Pacific Northwest with aggressive strains of late blight (US8-A2 mating type, and US11-A1 mating type.) Progeny from crosses with AWN86514-2 have been tested at Toluca Mexico with all known pathotypes of Phytophthera infestans and have shown a high incidence (34 percent) of resistant individuals. A90586-11 has high yield potential, and internal quality suitable for french fry processing. Late blight resistance has been similar to AWN86514-2. These two selections are half-sibs, with Ranger Russet as the pollen parent.