Novel Insecticides for the Management of Live Wood Eating Termites in Tea Plantations of Assam

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Abstract
Studies were undertaken to evaluate the efficacy of six insecticides having newer chemistry against termites infesting tea plantations in Assam, India during 2020-21 and 2021-22. All the tested insecticides viz., imidacloprid 600 FS @ 800ml/ ha, imidacloprid 17.8 SL @ 350 ml/ ha, fipronil 5 SC @ 2 L/ ha, imidacloprid 70 WG @ 160 g/ ha, clothianidin 50 WDG @ 250 g/ ha and chlorantraniliprole 18.5 SC @ 500 ml/ ha recorded significantly less per cent of both plant and portion of infestation as compared to the untreated plots at 30 and 60 days after application. Among the insecticides, application of clothianidin 50 WDG @ 250 g/ ha recorded significant reduction of termite infestation both in portion and plant basis at 30 (6.65 and 6.36%) and 60 (8.31 and 7.55%) days after treatment. After 60 days of application of clothianidin 50 WDG @ 250 g/ ha, 77.02% reduction of termite infestation was recorded over the control plots resulting in significant increase in the net profit. No residual effect was observed in the plucked tea leaves even after 7 days of application of clothianidin 50 WDG @ 250 g/ ha. Present investigation would help the tea growers concerning with termite prone areas to reduce the infestation without causing any harmful effect to the end users.

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