Bio-efficacy of insect growth regulators against bean pod borer, maruca vitrata F. Infesting country bean

Abstract

The Bean pod borer, Maruca vitrata F. (Lepidoptera: Crambidae) is a key pest of country bean causing severe yield loss. The present study was conducted to evaluate the efficacy of four insect growth regulators (IGRs) for managing the bean pod borer, on country bean. Four IGRs as T₁ = Lufenuron (Hayron 5 EC), T₂ = Emamectin Benzoate (Noclaim 5 SG), T₃ = Emamectin Benzoate + Lufenuron (Himam 50 WDG) and T₄ = Buprofezin (Award 40 SC) were used with three doses against M. vitrata. All the treatments were found significantly effective against the pod borer over untreated control. The highest efficacy was found in the Emamectin benzoate @ 1.0 g L^-1 water treated plots followed by Buprofezin @ 0.50 ml L^-1 water at 1^st, 3^rd and 7^th days after treatments (DATs). The highest number of healthy flowers per ten inflorescences (126.56) were recorded in Emamectin benzoate at 1.0 g L^-1 water treated plots but the lowest in the untreated control (68.11). The highest number of healthy pods were also observed in Emamectin Benzoate @ 1.0 g L^-1 water treated plots. The highest pods plant^-1 (760.33 g) were found from Emamectin benzoate at 1.0 g L^-1 water treated plots followed by Buprofezin at 0.50 ml L^-1. Conversely, the lowest weight of healthy pods per plant (478.33g) was recorded in the untreated control. So, based on bio-efficacy, among the IGRs studied, Emamectin benzoate may be used for better management of bean pod borer M. vitrata.

Bangladesh J. Agril. Res. 48(3): 325-333, September 2023