Abstract
The virulence of 174 isolates ofRhizoctonia 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. TheRhizoctonia 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 occurred on peat soil. An inoculation method using corn kernels infested with a virulent isolate ofRhizoctonia 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.
Compendio
En una prueba de invernadero se evaluó la virulencia de 174 aislamientos deRhizoctonia solani AG-3 sobre tallos de papa. Los aislamientos obtenidos de lesiones en los estolones, esclerocios sobre los tubérculos, e himenios sobre tallos aéreos fueron los más virulentes, aquellos procedentes de lesiones de tallos bajo tierra fueron intermedios y los aislamientos de una basidiospora los menos virulentos. El síndrome de la Rhizoctoniasis fue evaluado en tres zonas: en suelo arenoso bajo riego, en Becker, Minnesota, en suelo altamente margoso, en Grand Forks, North Dakota y en suelo turboso, en Anoka, Minnesota. La enfermedad fue más severa en el suelo arenoso bajo riego, intermedia en suelo altamente margoso y menos severa en el suelo turboso. Un método de inoculación, utilizando granos de maíz infestados con un aislamiento virulente deRhizoctonia solani, fue efectivo para reproducir la enfermedad. Tubérculos-semillas hasta con 15 % de su superficie cubierta con esclerocios, no reprodujeron la enfermedad de manera significativa.
En estas pruebas, los esclerocios sobre los tubérculos fueron más virulentos que el inóculo presente en el suelo.
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Former Research Assistant and Professor, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108.
Published as contribution No. 16,997 of the Minnesota Agricultural Experiment Station on research conducted under Project 22-35H.
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Hill, C.B., Anderson, N.A. An evaluation of potato disease caused by isolates ofRhizoctonia solani AG-3. American Potato Journal 66, 709–721 (1989). https://doi.org/10.1007/BF02896827
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DOI: https://doi.org/10.1007/BF02896827