Author(s):

BN Bhonde, SP Kakde and RR Kale

Abstract: A field experiment was carried out to evaluate the seasonal incidence of onion thrips at Vegetable Improvement Project, Research Farm Mahatma Phule Krishi Vidyapeeth, Rahuri, Maharashtra, during Kharif and Rabi season of the year 2013-14. Study on seasonal incidence of thrips (Thrips tabaci) was carried out on variety Basvant-780 during kharif and N-2-4-1 during rabi, 2013-14. In kharif season incidence of thrips was observed from 34^th August MW (fourteen days after transplanting). The incidence of thrips ranged from 0 to 34.56 thrips per plant. The highest population was recorded in 44^th MW (34.56 thrips/plant) (84 days after transplanting). The incidence of thrips was severe from 41^th to 45^th MW corresponding to mid week of October to first week of November. The population of coccinellids grub observed in kharif season ranged from 1.33-4.27 coccinellids/plant during 35^th to 50^th MW. The peak activity was noticed during 44^th MW October with population 4.27/plant. The studies revealed that correlation of thrips population with maximum temperature (0.6117**) was significant and positive, whereas rainfall, minimum temperature, relative humidity (AM), relative humidity (PM) was non significant and negative. In Rabi season incidence of thrips was observed from 2^nd January MW (fourteen days after transplanting). The incidence of thrips ranged from 5 to 32.15 thrips per plant. The highest population (32.15 thrips/plant) was recorded in 14^th April MW (98 days after transplanting). The incidence of thrips was severe from 12^th to 14^th MW corresponding to last week of March to first week of April. The population of coccinellids grub observed in rabi season ranged from 1.10-3.37 coccinellids/plant during 3^rd to 15^th MW with its peak activity 14^th MW.

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