Influence of sowing date of mustard on the epidemiology of white rust
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Authors
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V.M. HEGDE and K.H. ANAHOSUR
Division of Plant Pathoglogy, University of Agricultural Sciences, Dharwad 580 005
Keywords:
Mustard, white rust, sowing date, weather conditionsAbstract
Mustard crop sown during June 9 to August 23, 1988 recorded heavy leaf infection (74.9 to 86.1 %) and heavy floral systemic infection (41.3 to 61.0%) which was favoured by the more relative humidity (83.8 to 86.3%), more rainfall (3.1 to 9.3 mm) and optimum temperature (23.1 ° to 24.0°C). The crop sown during September 7 to 22, 1988 showed considerably reduced infection and crop sown on October 7, 22, 1988 was completely free from systemic infection. This was found to be due to less relative humidity (73.2-76.9%), less rainfall (0.0 to 0.6 mm). The rate of infection was high (0.3188 to 3288 in the early stage of infection and gradually reduced (0.0428 to 0.1164) and finally became negetive (-0.067 to 0.135).
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