Abstract
Field efficacy studies of three insecticides at different doses (fipronil 80WG @ 50, 75, 100 g; dimethoate 30EC @ 500, 625, 750 ml and malathion 50EC @ 625 ml/ ha) were carried out against thrips Thrips tebaci Lindeman and their natural enemies on onion crop during two consecutive rabi seasons of 2018-19 and 2019-20. The experiments were done at farmer’s field near Regional Research Station Gurdaspur. Results revealed that insecticidal treatments significantly reduced thrips incidence (45.12- 79.34% over control), of which dimethoate 30EC and fipronil 80WG were the best. The maximum bulb yield (292.87 q/ ha) was obtained with application of dimethoate 30EC @ 750 ml/ ha which was on par with fipronil 80WG @ 100 g/ ha (287.23 q/ ha). The cost: benefit ratio revealed that highest dose of dimethoate 30EC was superior giving maximum net returns with C: B of Rs. 1: 43. The evaluated insecticides did not have any effect on the natural enemies of onion insect pests.
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