Effectiveness of Botanical Insecticides for the Management of Legume Pod Borer, Maruca vitrata F. in Yard Long Bean

A research was conducted in the field of the Department of Entomology, Bangladesh Agricultural University (BAU), Mymensingh during rabi season 2016-17 to evaluate the efficacy of some botanicals viz. BioNeem plus, Mahogany oil, Karanja oil, Castor oil, Tobacco leaf extract, Urmoi fruit extract and Garlic clove extract and Nitro 505EC as positive control along with an untreated control for the management of legume pod borer, Maruca vitrata F. The experiment was designed as randomized complete block design with three replications of each treatment. The botanicals were evaluated based on the effectiveness on percentage reduction of flower and pod and increase of yield and pod yield. Among the botanical insecticides BioNeem plus (Azadirachtin) 1% @ 1.0 ml/L at 7 days intervals on the yard long bean showed the best performance in respect of reduction of flower and pod damage of 59.94 and 66.10 percent, respectively with significantly higher pod yield of 51.91 percent. Moderate efficacy was found from the Mahogany oil and Karanja oil @ 4 ml/L of water in case of flower (45.47 & 36.65%, respectively) and pod damage (50.36 & 41.27%, respectively) and yield increase (31.57 & 31.05%, respectively). It was also mentioned that BioNeem plus was better in different studied parameters than the chemical insecticides Nitro 505EC. The highest BCR was calculated from the BioNeem plus (1.39). Therefore, BioNeem plus might be used to successfully manage bean pod borer singly or in IPM packages. Key words: Yard long bean, legume pod borer, Maruca vitrata, Azadirachtin