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Title: A new Colletotrichum trifolii race identified in Ohio

Author
item Ariss, Jennifer
item RHODES, L - OHIO STATE UNIVERSITY

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 7/28/2006
Publication Date: 7/28/2006
Citation: Jennifer J. Ariss and Landon H. Rhodes. 2006. A new Colletotrichum trifolii race identified in Ohio. Phytopathology. 96:S6.

Interpretive Summary:

Technical Abstract: Colletotrichum trifolii, the causal agent of anthracnose of alfalfa, exists in the US as two distinct races, race 1 and race 2. An isolate of C. trifolii was identified at the Ohio State University's Waterman Agricultural and Natural Resources Laboratory, Columbus, OH, in 2003. The isolate (designation OH-WA-520) was retained and subjected to standard tests to identify the race of this isolate. Known race 1 and race 2 isolates were included for comparison to isolate OH-WA-520. Results of these studies revealed a reaction inconsistent with either C. trifolii race 1 or race 2. OH-WA-520 proved virulent on cultivars Saranac and Saranac AR but avirulent on Arc. These results are consistent with C. trifolii race 4 previously known only from Australia. To our knowledge, this is the first report in the US of an isolate consistent in reaction with Colletotrichum trifolii race 4 in the US.