MANAGEMENT OF LIPAPHIS ERYSIMI (KALT.) USING NEWER INSECTICIDES AND BIO-PESTICIDES IN RADISH
At present, there is a great deal of discussion on the resistance and resurgence of insects to commonly used insecticides which is of grave concern in crop protection. One of the solutions to the resistance problem is the rotation of newer insecticides with the conventional ones. Hence, an attempt has been made to evaluate newer insecticides and bio-pesticides to manage aphids Lipaphis erysimi (Kalt.) in radish. The field experiment was laid out in randomized block design (RBD) with three replications and 10 treatments with a plot size of 3 m x 2 m. In each plot, five plants were selected and tagged. The first spray was given after 18 days of sowing when sufficient buildup of aphid population was seen. Emamectin benzoate 5 SG @ 0.5 g/l was used as a blanket application for the management of defoliators. From each tagged plant, three leaves were selected from the upper, middle and lower part for counting the number of aphids per leaf with help of magnifying lens and the mean population of aphids per plant was worked out. Aphid population was recorded at one day before, three, seven and fourteen days after application of insecticides. The tuber yield per plant was recorded at each harvest separately for each treatment and the yield is converted to kg/plot. Obtained data were analyzed using ANOVA. Thiamethoxam, imidacloprid, and dimethoate were best and effective chemicals in reducing the population of aphids, whereas the two microbial pesticides were found to be less effective.
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