Field Evaluation of Different Insecticides against Blister beetle, Mylabris pustulata (Thunberg) on Pigeon pea

Abstract

A field experiment was conducted during Kharif, 2018 to evaluate the efficacy of different insecticides against blister beetle, Mylabris pustulata (Thunberg) in pigeon pea. Among the seven treatments tested, Flubendiamide 480 SC @ 30 g a.i ha^-1 was found to be effective and recorded 2.67 and 3.56 numbers plant^-1, respectively at 3 and 7 DAT after first spray followed by the treatment Indoxacarb 15.8 SC @ 73 g a.i ha^-1 which recorded 2.78 and 3.56 numbers plant^-1. The third treatment proved to be effective was Deltamethrin 2.8 EC @ 12.5 g a.i ha^-1 with the population of 3.22 and 3.78 numbers plant^-1. The similar trend of efficacy was noticed even after the second spray also. The order of efficacy of treatments in the population reduction of blister beetles was Flubendiamide 480 SC @ 30 g a.i ha^-1 > indoxacarb 15.8 SC @ 73 g a.i ha^-1 > Deltamethrin 2.8 EC @ 12.5 g a.i ha^-1 > Cypermethrin 25 EC @ 25 g a.i ha^-1 > Lambda cyhalothrin 5 EC @ 25 g a.i ha^-1 > NSKE 5%. As that of results on the efficacy of insecticides, the reduction percent in the blister beetle population also follows the similar trend of different treatments tested. This effectiveness also reflected in the highest grain yield of 1140.20 kg ha^-1 in Flubendiamide 480 SC @ 30 g a.i ha^-1 with a yield increase of 36.47% over untreated check. This was followed by indoxacarb 15.8 SC @ 73 g a.i ha^-1 (1102.3 kg ha^-1) > Deltamethrin 2.8 EC @ 12.5 g a.i ha^-1 (1072.0 kg ha^-1) > Cypermethrin 25 EC @ 25 g a.i ha^-1 (996.4 kg ha^-1) > Lambda cyhalothrin 5 EC @ 25 g a.i ha^-1 (991.7 kg ha^-1) > NSKE 5% (951.70 kg ha^-1).