Vol. 11, Issue 1 (2022)

Author(s):
Kavyashree S, Ganesha Naik R, Ravindra H, Nagarajappa Adivappar, and Sarvajna B Salimath

Abstract:
Powdery mildew disease of okra occurs on epidemic scale in areas of cool night temperatures and low relative humidity causing considerable yield loss. Weather factors such as temperature and moisture play a vital role in occurrence, prevalence and spread of powdery mildew disease. Experiment was conducted to correlate weather parameters with powdery mildew disease severity on okra at College of Agriculture, Shivamogga. Data on disease severity of powdery mildew was recorded at weekly intervals on susceptible okra cultivar ‘Arka Anamika’. Highly significant and negative correlation of disease severity with maximum and minimum relative humidity was observed at 1 per cent level of significance. While, significantly negative correlation of disease severity with wind speed was observed at 5 per cent level of significance. Negative correlation of disease severity with maximum and minimum temperature was observed. Average temperature range between 16.33 to 30.93 ⁰C, humidity ranged between 53.43 to 84.56 per cent, rainfall of 6.5 mm with wind speed of 4.56 km/hr was found to be an ideal condition for powdery mildew disease development on okra.