Anastomosis Group 3 Is the Major Cause of Rhizoctonia Disease of Potato in Maine

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Abstract
Three hundred seven isolates of Rhizoctonia solani associated with stem and stolon canker and black scurf of potato in Maine were characterized with regard to anastomosis group (AG). The results confirmed that members of AG-3 are the major cause of Rhizoctonia disease of potato in fields surveyed. One hundred percent of the isolates from tuberborne sclerotia and 82.1% of the isolates from stem and stolon lesions were members of AG-3. The most important non-AG-3 isolates were members of AG-5, which comprised 13.4% of the cultures isolated from stem and stolon lesions. Anastomosis group 2, type 1, associated with potato in other geographic areas, was not isolated from sclerotia, nor from infected plants in Maine.

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