Studies on the survival of sorghum anthracnose (Colletotrichum graminicola) pathogen on crop debris
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Authors
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A.N. MISRA and A.P. SINHA
Department of Plant Pathology, G.B. Pant University of Agric. & Tech., Pantnagar, Nainital 263 145
Keywords:
anthracnose, crop debris, Colletotrichum graminicola. sterilized soil, pathogen, survivalAbstract
The role of crop debris in the epidemiology of C. graminicola was determined. Infected sorghum leaves were stored in bags at temp. ranging from 11.5 to 40.3degC. Other leaves with abundant acervuli were incubated at 5, 15, 25, 30, 35, 40 and 45deg and stored in paper bags, in nylon bags buried in sterilized soil or in nylon bags in natural soil. The survival ability of the pathogen decreased rapidly with time. Recovery of the fungus from debris dropped to 90% after 4 months and to 10% after 9 or 10 months. Different temp. also affected survival of C. graminicola. The pathogen survived for 1 month at 45deg, for 5 months at 40deg and for 8 months at 30 and 35deg. At 5 and 15deg there was 90 and 80% recovery, respectively, of the pathogen after 10 months. The pathogen survived longer (9 months) in infected debris in sterilized soil than in natural soil.
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