Submitted to: Biological and Cultural Tests for Control of Plant Diseases
Publication Type: Abstract Only
Publication Acceptance Date: January 1, 2001
Publication Date: N/A
Interpretive Summary: Potato germplasm is evaluated each year for resistance to major field diseases in Idaho. This report describes the disease reaction of advanced breeding selections in the 2000 Western Regional and Tri State variety development trials compared with standard varieties. The diseases evaluated in this report are verticillium wilt, early blight, and common scab. Many of the breeding selections were more resistant to verticillium wilt and early blight compared with the standard varieties Russet Burbank and Russet Norkotah. Common scab was severe in 2000 and a number of the advanced trial entries showed a high level of susceptibility. This information is used in the selection process and provides documentation for variety release.
Technical Abstract: Potato breeding selections and standard cultivars were evaluated for their reaction to diseases that commonly occur in Idaho. Verticillium wilt, early blight and common scab evaluations were done in fields at the University of Idaho Research Center, Aberdeen. The growing season was unusually warm and dry through June, July, and August. In general, Verticillium wilt was more severe than normal and early blight less severe. Common scab in the test plots was exceptionally severe on the more susceptible clones such as Ranger Russet, Shepody, A90586-11, AC87079-3, A92303-7, AO87277-6 and a number of chipping cultivars. Bannock Russet continued to show very good resistance to Verticillium wilt and early blight as did many of the breeding clones reflecting the selection pressure for early dying resistance.