Prediction of cotton leaf curl virus disease and its management through resistant germplasm and bio-products

摘要

Cotton leaf curl virus disease reduces the cotton yield significantly every year and is transmitted by Bemisia tabaci. The study was designed to evaluate 15 varieties/lines against the disease. Multiple regression analysis was performed based on a-biotic environmental variables (maximum air temperature, minimum air temperature, relative humidity and rainfall) to predict disease incidence and its vector (Bemisia tabaci). Two bio-products were evaluated against the whitefly population to control the disease. Out of 15 cotton varieties/ lines, no one was found highly resistant against the disease. Five varieties/lines (BT BT-980, BT-457, KIRAN, BT-666 and SLH-BT-6) exhibited moderately resistant response. Maximum air temperature (34-35.5 °C), minimumtemperature (25.75-26.25 °C), relative humidity (64.14-66%), rainfall (1-2 mm) and wind speed (5.50-5.75 Kmhr1) favoured the disease development. Maximum whitefly population was favoured by maximum air temperature from 34-35.5 °C, 25.8-26.2 °C minimumair temperature, 64.14-66% relative humidity, 1-2 mm from rainfall and 5.50-5.75 Kmh"1 wind speed. Datura stramonium was found more effective as compared to Aviara (Homoeopathic) but not from the positive control (Acetamiprid).