Abstract

Fifty-two alfalfa cultivars were evaluated for reaction to Colletotrichum trifolii (anthracnose) by a standardized seeding assay and during natural epidemics. An anthracnose index was calculated for each cultivar by dividing the number of stems with foliar symptoms per square meter by the number observed for Saranac (the susceptible standard cultivar) and multiplying by 100. Cultivar ranks based on this anthracnose index were significantly correlated with rankings based on percent resistant seedlings determined in the standardized seedling assay. (…)

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