MANAGEMENT OF INSECT PESTS OF GROUNDNUT BY BIORATIONAL PESTICIDES

Abstract

A field experiment was conducted to study the management of insect pests of groundnut by biorational pesticides. BARI Chinabadam-8 was used as the test crop for the experiment to evaluate the treatments’ effect on insect pests. Eight treatments were applied at 10 days interval viz. T 1 : Neem seed kernel @5 g/L of water, T : Spinosad @0.5 mL/L of water, T 3 : Buprofezin @0.2 g/L of water, T : Lufenuron @0.2 g/L of water, T 5 : Emamectin Benzoate @1.0 mL/L of water, T : Lamda cyhalothrin @1 mL/L of water + Biotrin @1 mL/L of water, T : Actara @ 0.5 g/L of water + Ecomec 1.8 EC @1 mL/L of water and T 8 7 : Untreated control. Available insect pests namely aphid, whitefly, hairy caterpillar, thrips and jassid were found in the study field. Spinosad @0.5 mL/L of water at 10 days interval (T ) showed best performance in reducing aphid and hairy caterpillar population, also their infestation. Treatment T effectively reduced the whitefly population. For reducing thrips population, treatment T 6 7 showed best performance. Similarly T 2 with T worked best against jassid population. Highest number of all available insect pest population was found in the untreated control plot. Treatment T also showed the best results on yield and yield contributing characteristics viz. maximum pod/plant (22.17) and yield (2.69 t/ha) . The minimum pod/plant (11.20) and lowest yield (1.31 t/ha) was obtained from the untreated control plot, T 8 2 . From the study, a strong negative relationship between available insect population and yield of groundnut was found.