Some epidemiological aspects of white rot of pea
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Authors
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C.L. SHARMA and A.S. KAPOOR
Department of Pathology, HPKV, Palampur 176062
Keywords:
Epidemic, white rot, pea, Sclerotinia sclerotiorumAbstract
Growth and sclerotial formation of Sclerotinia sclerotiorum occurred within the temperature range 10 to 25deg C, the optimum being at 20 to 25degree C. A temperature range of 15 to 20degree C, however, was found to be the most favourable for number and dry weight ofsclerotia whereas, size of sclerotia was maximum at 5degree C and progressively decreased with the increase in temperature. One to 2 months of preconditioning showed increased myceliogenic and carpogenic germination. Ascospores started germinating within 4 h at a temperature range of 5 to 25degree C (optimum 20degree C). Spore germination increased with increase in incubation period even at sub-optimum temperatures of 12degree C. As leaf wetness of pea (cv. Lincoln) increased, infection efficiency of S. sclerotiorum increased. Sclerotia of S. sclerotiorum were found to survive more than a year in soil. Sclerotial germination and decomposition decreased with increasing soil depth under wet humid conditions whereas the reverse occurred in snow bound areas in Himachal Pradesh, India.
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