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An evaluation of potato disease caused by isolates of rhizoctonia solani ag 3

An evaluation of potato disease caused by isolates of rhizoctonia solani ag 3

American Potato Journal 66(11): 709-722

ISSN/ISBN: 0003-0589

The virulence of 174 isolates of Rhizoctonia solani AG-3 was evaluated on potato stems in a greenhouse test. Isolates obtained from lesions on stolons, sclerotia on tubers, and hymenia on aerial stems were the most virulent, those from below ground stem lesions were intermediate, and single basidiospore isolates were the least virulent. The Rhizoctonia disease syndrome was evaluated in three areas: on irrigated sand at Becker, Minnesota, on nonirrigated heavy loam soil at Grand Forks, North Dakota, and on peat soil, Anoka, Minnesota. The disease was most severe on irrigated sand, intermediate on heavy loam, and the least disease ocurred on peat soil. An inoculation method using corn kernels infested with a virulent isolate of Rhizoctonia solani was effective in causing disease. Seed tubers with up to 15 percent of their surface area covered with sclerotia did not cause significant disease. In these tests, sclerotia on tubers caused more disease than soil borne inoculum.

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Accession: 007009396

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