INSECT PESTS INCIDENCE IN GROUNDNUT AND THEIR MANAGEMENT

Abstract

The experiment was conducted in the field of Sher-e-Bangla Agricultural University farm, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from December 2013 to May 2014 to study the insect pests incidence in groundnut and their management. Jhingabadam variety was used as a test crop for this experiment. The experiment comprised of the following treatments -T1: Neem oil @ 5 ml with trix 10 ml at 10 days interval; T2: Dimethoate (Tafhor 40EC) @ 2.0 ml/L of water at 10 ml at 10 days interval; T3: Imidacloprid (Admire 200SL) 0.5 ml/L of water at 10 ml at 10 days interval; T4 : Lambda- cyhalothrin (Reeva 2.5 EC) @ 1.0 ml/L of water at 10 ml at 10 days interval; T5: Tiametoxam + Clorantraniliprole (Voliam flexi 3000SC) @ 0.5 ml/L of water at 10 ml at 10 days interval; T6: Chlorpyrifos + Cypermethrin (Nitro 505EC) @ 1.0 ml/L of water at 10 ml at 10 days interval; and T7: Untreated control. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The highest percentage of infested shoots/plant at early, mid, late flowering stage (13.25%, 15.56%, 18.75% respectively) was observed in T7 treatment while the lowest percentage of infested shoots/plant (3.48%, 3.49%, 3.26% respectively) was observed in T6 treatment . The highest percentage of infested flowers/plant at early, mid, and late flowering stage (12.04%, 13.69%, 14.70% respectively) was observed in T7 treatment while the lowest percentage (2.16%, 3.09%, 3.96% respectively) was found in T6 treatment. The highest plant height (53.30 cm) was recorded in T6 treatment and the lowest (40.88cm) was found in T7 treatment . The maximum yield per hectare (2.72 ton) was found in T6 treatment and minimum yield (1.98 ton) was observed in T7 treatment. The findings of the current study indicated that spraying of Chlorpyrifos + Cypermethrin (Nitro 505EC) @ 1.0 ml/L of water at 10 days interval was the best effective treatment for the management of major insect pests of groundnut cultivation.