INSECT PEST INFESTATION STATUS ON LOCAL POTATO VARIETY (LAL PAKRI) AND THEIR BIORATIONAL MANAGEMENT

Abstract

Potato, Solanum tuberosum L. is the king of vegetables in Bangladesh. Potato is a prominent crop in consideration of production and its internal demand in Bangladesh. An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka,Bangladesh during the period from October, 2020 to September,2021 study the effect of different insecticides in controlling potato insects. The experiment was laid out in Randomized Complete Block Design replicated with three times. For this study, seven treatment combinations like T 1 = Spraying Neem oil @5ml/L of water; T 2 = Spraying Neem seed kernel extract @5g/L of water; T 3 = Spraying Spinosad @0.5ml/L of water; T 4 = Buprofezin 40wp @0.5g/L; T 5 = Emamectin Benzoate 1ml/L; T 6 = Matrin @1ml/L and T 7 = Untreated control. Neem oil (T 1 ) showed the best performance in terms of insect incidence of aphid, cutworm and field cricket, potato tuber infestation by number and weight and yield (2.54 aphid/5 tagged plants, 0.85 cutworm per plot, 1.61 field cricket per plot, 18.88%, 5.79% and 48.76 t/ha, respectively). In case of Jassid infestation Emamectin Benzoate (T 5 ) showed the best performance 1.82 Jassid/5 tagged plants. The natural enemy ladybird beetle was found high in T 1 applied field (4.18 ladybird beetle/5 tagged plants). So, from this study it can be revealed that, neem oil can play an important role in reducing the incidence of insect pests of potato as well as increase the incidence of natural enemies and yield of potato in the field condition.