Late leaf spot of grondnut caused by Cercosporidium personatum is one of the serious diseases in groundnut. Time of sowing trails were conducted for both irrigated and rainfed conditions. The incidence of late leaf spot was high in the sowing taken up on 16-9-85 (rainfed) while minimum incidence was in the sowing on 1-7-85. In the irrigated season, maximum incidence was in the sowing taken up on 16-2-85 while minimum ws in 17-4-86 sowing. In bot seasons, early sowings recorded higher yield of groundut pods. There was negative association with disease intensity and yield parameters like shelling percentage and pod yields. Multiple regression studies with weather factors and late leaf spot revealed that the rainfall and relative humidity exerted a positive association with disease incidence while wind velocity had negative correlation.
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Tamil Nadu, India.
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