INSECT PESTS INCIDENCE IN MUNGBEAN AND THEIR MANAGEMENT

Abstract

The experiment was conducted at the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to study the insect pest incidence in mungbean and their management. BARI Mung-5 was used as the test crop of this experiment. The experiment consists of the following treatments: T1: Sevin 85 WP @ 2.5 gm/L of water at 15 days interval; T2: Dursban 20 EC @ 2.0 ml/L of water at 15 days interval; T3: Sumi Alpha 5 EC @ 1.0 ml/L of water at 15 days interval; T4: Actara @ 0.5 gm/L of water at 15 days interval; T5: Marshal 20 EC @ 2.0 ml/L of water at 15 days interval; T6: Neem seed kernel extract @ 20 gm/L of water at 15 days interval and T7: Untreated control. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The lowest stemfly infestation (4.50%), lowest stem tunneling (6.22%) and lowest number of stemfly larvae/pupae (0.25) was recorded from T5 (Marshal 20 EC @ 2.0 ml/L of water), whereas the highest stemfly infestation (22.50%), highest stem tunneling (19.71%) and highest number of stemfly larvae/pupae (2.17) was found from T7 (untreated control) treatment, respectively. The lowest number of jassid per 10 leaves (1.36), lowest number of whitefly per 10 leaves (1.20), lowest number of hairy caterpillar per plant (1.00), lowest number of thrips per 10 flowers (1.20) was found from T5 (Marshal 20 EC @ 2.0 ml/L of water), while the highest number of jassid per 10 leaves (9.78), highest number of whitefly per 10 leaves (5.67), highest number of hairy caterpillar per plant (4.10) and highest number of thrips per 10 flowers (5.40) was observed from T7 (untreated control) treatment, respectively. At early, mid and late stage, the highest percent of infested pods plant-1 in number (11.86%, 15.02% and 17.02%) was recorded in T7 (untreated control) treatment again, the lowest infestation percent in number (3.94%, 5.38% and 5.68%) was recorded in T5 (Marshal 20 EC @ 2.0 ml/L of water) treatment, respectively. The highest yield per hectare (1.78 ton) and highest benefit cost ratio (2.65) was found in T5 (Marshal 20 EC @ 2.0 ml/L of water) treatment, whereas the lowest yield per hectare (1.33 ton) and lowest benefit cost ratio (1.04) in T7 (untreated control). Marshal 20 EC @ 2.0 ml/L of water was more effective among the management practices for controlling insect pest of mungbean which was followed by Dursban 20 EC @ 2.0 ml/L of water and Neem seed kernel extract @ 20 gm/L of water.