Submitted to: Biological and Cultural Tests for Control of Plant Diseases
Publication Type: Abstract only
Publication Acceptance Date: 1/1/1999
Publication Date: N/A
Citation: Interpretive Summary: Potato germplasm is evaluated for resistance to major field diseases in Idaho each year. This report describes the disease reaction of advanced breeding selections in the 1998 Western Regional and Tri State variety development trials compared with standard varieties. The disease reactions evaluated in this report are for verticillium wilt, early blight, common scab, and bacterial soft rot. Many of the breeding selections were more resistant to verticillium wilt and early blight compared with the standard varieties Russet Burbank and Russet Norkotah. However several are more susceptible to common scab. 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 generally warm and dry through July and August. Early blight became very severe by early September in spite of a preventative late blight fungicide program. Tubers were evaluated for soft rot after 5 days incubation in a mist chamber at 20 degrees C. Breeding selection A90586-11 has shown good general resistance to late blight strains US8 and US11 in tests in the Pacific Northwest. It also is very resistant to Verticillium wilt and had the lowest early blight rating in this year's evaluations. It is a high yielding, non-russet selection with maturity characteristics similar to Russet Burbank and has French fry processing quality. The Russet Norkotah clonal selections CORN 3 and 8, and TXNS112; 223; and 278 had similar early blight reaction but were somewhat less susceptible to Verticillium wilt in comparison with the parent type.