Author(s):

P Thilagam, A Gopikrishnan and D Dinakaran

Abstract: Two field experiments were conducted during Kharif, 2018 and 2019 to evaluate the efficacy of chemical insecticides against podbug, Clavigralla gibbosa (Spinola) in pigeonpea. Among the chemical insecticides tested, the plots treated with Acephate 75 SP @ 750 g a.i ha^-1 was found to be effective and recorded 3.00 Nos per plant at 3 DAT after first spray. The second effective chemical insecticides viz., Acetamiprid 20 SP @ 20 g a.i ha^-1 (3.44 Nos / plant) and Qunialphos 25 EC @ 250 g a.i ha^-1 (4.00 Nos / plant) were found to be on par with each other at 3 DAT. This was followed by the next two treatments viz., Chlorpyriphos 20 EC @ 250 g a.i ha^-1 and Fipronil 80 WG @ 50 g a.i ha^-1 (4.33 Nos / plant) which were on par with each other. The fourth effective treatment was Profenophos 50 EC @ 500 g a.i ha-1 (4.67 Nos / plant) treated plots, The highest population of podbug was recorded in Deltamethrin 2.8 EC@ 12.5 g a.i. ha^-1 (5.78 Nos./plant) treated plots. In relation to the grain damage, the lowest was recorded in Acephate 75 SP @ 750 g a.i. ha^-1 treated plots with the highest grain yield of 1143.3 kg ha^-1 and contributes 58.1 per cent of yield increase over untreated check (723.3 kg ha^-1).

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