IMPACT OF FOUR INSECTICIDES AGAINST MARUCA VITRATA F. (LEPIDOPTERA: CRAMBIDAE) ON YARD LONG BEAN

ABSTRACT: The vegetable growers are facing serious problem to legume pod borer, Maruca vitrata F. (Lepidoptera: Crambidae), the most destructive pest of yard long bean. The experiment was conducted during February to June 2022 in the experimental field of the Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur. Four insecticidal treatments, Lambdacyhalothrin + Profenofos (ACC-35) (T1), Emamectin benzoate (Noclaim 5 SG) (T2), Spinosad (Success 2.5 SC) (T3), Azadirachtin (Neemoz 0.1%) (T4) and an untreated control (T5) were evaluated against M. vitrata. All the insecticide treatments were found promising against the pod borer as compared to untreated control. However, the highest number of healthy pods plant-1 (15.56, 13.89 and 13.22) were found from Spinosad @ 0.60 ml L-1 of water treated plots while the lowest (4.78, 4.33 and 4.89) in the untreated control after 1st, 2nd and 3rd spray, respectively. The highest pooled mean healthy pods were obtained as 97.40, 94.01 and 101.86 g from Spinosad @ 0.6 ml L-1 of water treated plot but the lowest as 29.85, 29.67 and 36.13 g in the untreated control at 5, 10 and 15 days, respectively after 1st, 2nd and 3rd spray. The highest pooled mean protection over control were recorded as 87.29, 85.33 and 88.33% from Spinosad @ 0.6 ml L-1 of water treated plot while the lowest were 60.09, 40.01 and 62.07% from Lambdacyhalothrin+ Profenofos at 5, 10 and 15 days, respectively after 1st, 2nd and 3rd spray. Hence, farmers can use these tested insecticides especially Spinosad for effective management of M. vitrata in yard long bean. 

Keywords: Legume pod borer, Lambdacyhalothrin, Profenophos, Spinosad, Emamectin benzoate, Azadiractin.