EVALUATION OF DIFFERENT MANAGEMENT PRACTICES IN CONTROLLING MAJOR INSECT PESTS OF COUNTRY BEAN

Abstract

The experiment was conducted at the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the performance of different management practices in controlling major insect pests of country bean (BARI seem-3) during the period from June to December, 2012. The experiment consists of the following management practices: T0: Untreated control; T1: Hand picking of infested plant parts at 7 days interval; T2:Release of Trichogramma evanescence@ 0.5 g/6 m2 at 15 days interval T3:Spraying of neem oil @ 4ml/L of water at 7 days interval ; T4: Spraying of neem oil @ 4ml/L of water + Hand picking of infested plant parts at 7 days interval and T5: Spraying of neem oil @ 4ml/L of water and hand picking of infested plant parts at 7 days interval + Release of Trichogramma evanescence @ 0.5 g/6m2 at 15 days interval. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. In consideration of total growing period by number the % pods infestation, the lowest infested pods plant-1 by number was observed from T5 (7.13%), where the highest pod infestation was found from T0 (21.63%), % pod infestation in weight, the lowest infested pods plant-1 was observed from T5 (7.09%), whereas the highest in T0 (21.40%). The highest no. of inflorescence plant-1 was observed from T5 (37.00) while the lowest no. was observed from T0 (31.50) treatment. The highest yield hectare-1 was found from T5 (15.97 ton), while the lowest yield hectare-1 was found from T0 (10.71 ton) treatments. The pod yield of country bean was highly significant (p=0.01), strong (r=0.982) and negatively correlated with pod infestation by number i.e., the yield was decreased with the increase of pod infestation by number. Considering the controlling of country bean insect pests with some control options where, highest benefit cost ratio (4.21) was recorded in the treatment T5 and the lowest benefit cost ratio was recorded from T1 (1.32). The pod yield of country bean was highly significant (p=0.01), strong (r=0.977, r=0.813, r=0.981, r=977) and positively correlated with no. of pods inflorescence-1, pod length, no. of inflorescence plant-1, no. of flower inflorescence-1 i.e., the yield was increased with the increase of pods inflorescence-1, pod length, no. of inflorescence plant-1, no. of flower inflorescence-1. From the study, it may be concluded that treatment T5 which comprised with the spraying of neem oil @ 4ml/L of water and hand picking of infested plant parts at 7 days interval + Release of Trichogramma evanescence @ 0.5g/6m2 at 15 days interval was more effective among the management practices for controlling majot insect pests of country bean which was followed by spraying of neem oil @ 4ml/L of water +Hand picking of infested plant parts at 7 days interval.