Bio-Efficacy of Chemical Insecticides Against Defoliators Spodoptera litura and Achaea janata in Castor

Abstract

Field experiments on bio-efficacy of chemical insecticides against defoliators Spodoptera litura and Achaea janata in castor was carried out at Main Oilseeds Research Station, Junagadh Agricultural University, Junagadh during consecutive three year i.e. 2015-16, 2016-17 and 2017-2018. All the treatments were significantly superior over untreated check. Results of the experiment indicated that lowest number of larvae per plant for S. litura and A. janata was recorded in the treatment of chlorantraniliprole 18.5 SC 0.006% (0.42 & 0.22 larvae/plant), which was at par with the most of the insecticidal treatments except the treatment of poneem after three days of the first spray. More or less similar trend was observed after 7 and 14 days of first spray as well as 3,7 and 14 days after second spray. The highest net return was recorded in treatment of indoxacarb 14.5 SC 0.0073% (Rs. 31870/-) followed by the treatment chlorantraniliprole 18.5 SC 0.006% (Rs. 31080/-), spinosad 45 SC 0.009% (Rs.29240/-) and emamectin benzoate 5 % WG 0.002 % (Rs. 26232/-). Looking to the ICBR, the treatment of profenophos 40 % + cypermethrin 4% 44 EC noted the highest ICBR i.e. (1:11.60) followed by the treatment of chlorpyriphos 20 EC 0.05% (1: 10.20), indoxacarb 14.5 SC 0.0073% (1:9.30) and emamectin benzoate 5 % WG 0.002 % (1:7.30).