Factors associated with the development of leaf spot disease of soybean

Reference Report for SoyBase731011031

Title:	Factors associated with the development of leaf spot disease of soybean
Authors:	Ghosh, S., Purkayastha, R.P.
Source:	Indian J. Plant Pathol. 1989, 7(2):115-120
Abstract:	Development of leaf spot disease of soybean [Glycine max] caused by Myrothecium roridum Tode ex. Fr. (Strain M-1) is affected significantly by the ages of plants, leaves, spores, density of inoculum and similarity/disparity between host and pathogen-antigens. Percentage production of lesions decreased with the age of plants up to 60 days irrespective of cultivars used. Younger leaves were found to be more vulnerable to Myrothecium infection than older ones. Spores collected from 7-15 day-old cultures were most virulent while spores from 60-90 day-old cultures were more or less avirulent. Production and spread of lesions increased with increasing inoculum density up to 1010 spores/ml but decreased significantly when spore concentration was further increased (1012 spores/ml). Common antigenic relationship between susceptible cv. DS-74-24-2 and the pathogen was confirmed by immunoelectrophoretic test. Host-pathogen antigens appear to be an important factor in regulating disease reaction in soybean

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