Developing economic threshold level for thrips (Thrips tabaci L.) in onion bulb crop

Thrips (Thrips tabaci. L) are considered to be one of the major pests of onion. Seasonal abundance and effect on onion bulb yield were studied for onion thrips during two consecutive years (Rabi, 2019-20 and 2020-21) to develop economic thresholds (ET) at the Regional Research Station, Nashik (Maharashtra). On the basis of means of two years results revealed that, the economic injury level (EIL) of thrips in onion bulb crop was found to be 17.39 thrips/plant. The economic threshold level (ETL) of thrips in the onion bulb crop was worked out as 13 thrips/plant. Economic Thresholds were calculated with best yield infestation relationship which was found at 50 days after transplanting and control expenditure required for six insecticide sprays. The market price of onion was taken at Rs. 1152/= per quintal, which was an average of two years. Farmers are applying calendar-based application of different pesticides for management of insect pests.