Submitted to: Biological and Cultural Tests for Control of Plant Diseases
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 1, 1996
Publication Date: N/A
Technical Abstract: Potato breeding selections and cultivars were evaluated for their reaction to Verticillium wilt, early blight, and common scab under field conditions in Idaho. Two trials were planted, one in late April, another in mid May, as randomized complete blocks. Both sites were sprinkler irrigated. Natural soilborne inoculum of V.dahliae and S. scabies occurred at both sites. Early blight spreader rows of cv.Pioneer were included in the earlier planted site. Final foliar disease ratings were made on 5 September. The growing season was unusually cool and wet. A June 10 freeze affected the normal development of the early-planted trial. Early blight readings are from both sites, Verticillium wilt from the early planted site, and common scab from the late planted site. Common scab was less severe than normal and only a few of the most susceptible clones had significant scab. AO80432-1 and AWN85510-2 showed serious scab susceptibility. Verticillium wilt progressed more slowly than usual and only one breeding selection, BC0894-2 appeared to be highly susceptible. Early blight developed rapidly late in the growing season. Several breeding selections showed good early blight resistance under these conditions: A84118-3, A080432-1, A085165-1, A81480-6, A8792-1, AWN85510-2, and AWN85540-1. All of these were resistant to Verticillium and show potential for general early dying resistance.