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Resistance of sorghum sorghum bicolor to colletotrichum graminicola

, : Resistance of sorghum sorghum bicolor to colletotrichum graminicola. Plant Disease 66(9): 773-775

Twenty-three sorghum (S. bicolor) cultivars were evaluated in the greenhouse and at the Purdue Agronomy Farm [Indiana, USA] for resistance to C. graminicola. Seedling blight reactions in the greenhouse were significantly correlated with leaf blight reactions of adult plants in the field (r = 0.87**, P < 0.01), although leaf anthracnose severity was usually higher in the field than in the greenhouse. None of the sorghum seedlings inoculated with C. graminicola 15 days after planting anthracnose symptoms; however, seedlings inoculated 25 or 35 days after planting in the greenhouse produced typical anthracnose lesions. Susceptibility or resistance to C. graminicola could be determined 25-35 days after planting at the 4- to 7-leaf stages. The fungus sporulated in lesions on cultivars susceptible and resistant to C. graminicola but not in lesions on cultivars that were hypersensitive-resistant.


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