Abstract
Sensitivity of weather to the incidences of the leaf spot disease on groundnut was studied. Using data collected by PPQ & S during regular survey in different parts of the country it was observed that the disease occurred more frequently in Andhra Pradesh, Karnataka, Gujarat and Maharashtra both in kharif and rabi seasons from 1988-1998. Weather systems causing drop in temperature associated with rainfall and overcast condition leading to increase in relative humidity favoured incidence of the disease particularly when the crop was in pod formation to maturity stages. Decrease in maximum temperature £30° C and increase in morning and afternoon relative humidity ³ 80% and 60% respectively under cloudy condition (2 - 8 okta) associated with rainfall were found to be congenial for the development of the disease in moderate to severe intensities. This weather based information along with field observations on incidence of this disease could be used to forewarn the incidence of the leaf spot disease on groundnut for taking plant protection measures at appropriate time through Agromet Advisory Service.
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