DAMAGE ASSESSMENT AND MANAGEMENT OF INSECT AND MITE PESTS ON CHILLI

Abstract

The study was conducted in the experimental field of SAU, Dhaka during the period from October, 2019 to February, 2020 to find out the damage and management of insect and mite pests on chilli. The experiment was laid out in Randomized Complete Block Design with three replications. For this study, treatments T : Spraying Confidor 2G @ 0.2g/L of water at 7 days intervals; T 2 1 : Spraying Actara 25WG @ 0.05g/L of water at 7 days intervals; T : Spraying Ethion 46.5EC @ 3ml/L of water at 7 days intervals; T 4 3 : Spraying Omite 57EC @ 2ml/L of water at 7 days intervals; T : Spraying Neem Oil @ 3ml/L of water mixing with 10ml/10gm detergent or trix at 7 days intervals; T : Spraying Bioneem Plus 1EC @ 1ml/L of water at 7 days intervals and T 7 6 : Untreated control where only water were sprayed at 7 days intervals. From this study T showed the best performance in terms of number of aphids, thrips, gram pod borer, tobacco caterpillar, and mites (0.53 aphids, 1.04 thrips, 1.19 gram pod borer, 0.60 tobacco caterpillar and 0.81 mites, respectively). T 3 decreases the number of insect pests of chili.Beside this, T 3 3 also decreases the number of infested leaves, aphid infested leaves, thrips infested leaves, mite infested leaves and percent leaf infestation (102.40 leaves, 97.33 leaves, 87.33 leaves, 78.40 leaves, and 96.42%, respectively) and increases total number of leaves (106.2 leaves). It also decreases total number of infested fruits, thrips infested fruits, bored fruits and percent fruit infestation (9.40 fruits, 8.10 fruits, 2.70 fruits and 7.99%, respectively) whereas it increases total number of fruits (117.60 fruits). Again it decreases total number of infested plants and percent plant infestation (3.00 plants and 30.00%, respectively), whereas it increases the number of branches and plant height (12.47 branches and 67.60 cm, respectively). In case of yield attributing characteristics, T increases fruit length, fruit girth, healthy fruit weight, infested fruit weight, total fruit weight/plot and yield of chilli (6.40 cm, 3.30 cm, 1.41 kg, 0.82 kg, 2.23 kg and 7.43 t/ha, respectively).