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Two new pathotypes of Puccinia triticina, 121R60-1 and 377R60-1 the latter virulent on Lr28, are described for the first time. Both the pathotypes are designated as MHTTS as per North American system of pathotype identification. Pathotype 377R60-1 appears to be the result of a single step mutation for virulence to Lr28 in pathotype 121R60-1. Both pathotypes appear closely related to the most prevalent...
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