Efficacy of Insecticides Against Diamondback Moth (Plutella Xylostella Linn.) in Cabbage (Brassica Oleracea Linn.)

Abstract

The field experiment entitled “Efficacy of insecticides against Diamondback Moth (Plutella xylostella Linn.) in cabbage (Brassica oleracea Linn.)” was conducted in Randomized Block Design with three replications and seven treatments during Rabi season, 2020-2021 at Crop Research Centre, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut (U.P.) 250110. During the trial the larval population of diamondback moth was recorded from November to February (2020- 2021) in all plots. The larval population of DMB reached its peak (7.33 larvae/ 5 plant) at last week of January 2021, (4th standard week) when, the maximum and minimum temperature were 18.8 ℃ and 6.46 °C, respectively with 73.64 per cent relative humidity and 0.0 mm rainfall. The correlation study between the larval population of diamondback moth and weather parameters showed a negative correlation with maximum and minimum temperature (r = -0.847 and -0.664), and positive a association with relative humidity (r = 0.818), and rainfall (r = 0.161). Among all the insecticides Chlorantraniliprole 18.5% SC @ 10g a.i./ ha was most effective in controlling larval population of DMB followed by Spinosad 2.5% SC @ 16g a.i./ ha, Emamectin Benzoate 5% SG 8.75g a.i./ ha, Flubendiamide 39.35 % SC @ 18.24 a.i./ ha, Indoxacarb 14.5% SC @ 35 g/ ha in both the sprays. The Novaluron 10 EC @ 75 g a.i./ ha was found to be least effective, but it was significantly superior over the Untreated plot. Among all insectides the maximum C:B ratio and yield is obtained in plot treated with Chlorantraniliprole 18.5% SC @ 10g a.i./ ha preceded by Flubendiamide 39.35 % SC @ 18.24 a.i/ ha with second-best C: B ratio and second highest yield in the plot treated with Spinosad 2.5% SC @ 16 g /ha and Novaluron 10 EC @ 75 g/ ha has the lowest C:B ratio and yield.