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ARS Home » Pacific West Area » Kimberly, Idaho » Northwest Irrigation and Soils Research » Research » Publications at this Location » Publication #59946
Title: INFLUENCE OF CONTINUOUS CROPPING OF SEVERAL POTATO CLONES ON THE EPIDEMIOLOGY OF VERTICILLIUM WILT OF POTATO

Author
item DAVIS, J - UNIVERSITY OF IDAHO
item Pavek, Joseph
item Corsini, Dennis
item SORENSEN, L - UNIVERSITY OF IDAHO
item SCHNEIDER, A - UNIVERSITY OF IDAHO
item EVERSON, D - UNIVERSITY OF IDAHO
item Westermann, Dale
item HUISMAN, O - UNIVERSITY OF CALIFORNIA

Submitted to: American Phytopathological Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/1/1994
Publication Date: N/A
Citation: N/A

Interpretive Summary: Two field studies with potato were conducted to study the effects of continuous cropping of Verticillium-resistant potato clones on the epidemiology of Verticillium wilt of potato. Investigations focused on effects of continuous cropping of different clones on wilt incidence. Verticillium dahliae reproduction with the host, changes in the soilborne inoculum density, crop yields, and effects on succeeding crops of susceptible cultivars. Each study involved 5 yr of continuous cropping with potato. Five cultivars with different levels of resistance were planted in the first study. These were Russet Burbank and Butte (susceptible), Targhee (resistant), and A66107-51 and A68113-4 (highly resistant). The second study included the susceptible cultivar Russet Burbank, the resistant clone -51, a nonhost (corn), and a fallow treatment. There was no evidence for change in the relative resistance of the cultivars, nor was there evidence that an extremely virulent strain of V. dahliae was enhanced selectively from the indigenous population. All resistant clones remained nearly symptomless and resistant to stem colonization. When resistant potato clones are integrated into a potato production program, they appear to limit Verticillium wilt severity both during the years in which they are grown and in following crops of susceptible cultivars.

Technical Abstract: Two field studies with potato were conducted to study the effects of continuous cropping of Verticillium-resistant potato clones on the epidemiology of Verticillium wilt of potato. Investigations focused on effects of continuous cropping of different clones on wilt incidence. Verticillium dahliae reproduction with the host, changes in the soilborne inoculum density, crop yields, and effects on succeeding crops of susceptible cultivars. Each study involved 5 yr of continuous cropping with potato. Five cultivars with different levels of resistance were planted in the first study. These were Russet Burbank and Butte (susceptible), Targhee (resistant), and A66107-51 and A68113-4 (highly resistant). The second study included the susceptible cultivar Russet Burbank, the resistant clone -51, a nonhost (corn), and a fallow treatment. There was no evidence for change in the relative resistance of the cultivars, nor was there evidence that an extremely virulent strain of V. dahliae was enhanced selectively from the indigenous population. All resistant clones remained nearly symptomless and resistant to stem colonization. When resistant potato clones are integrated into a potato production program, they appear to limit Verticillium wilt severity both during the years in which they are grown and in following crops of susceptible cultivars.