STUDY ON BIOLOGY OF MANGO MEALYBUG AND THEIR CHEMICAL CONTROL IN LABORATORY

Abstract

The experiment was conducted at Entomology laboratory of Sher-e-Bangla Agricultural University campus Dhaka during the period from September, 2021 to June, 2022 to study the biology and chemical control of mango mealybug Drosicha mangiferae (Green). Seven chemical insecticides treatments viz. T1 = Nitro 505 EC (Chlorpyrifos + Cypermethrin) @1ml/L of water, T2 = Karate 2.5 EC(Lambda Cyhalothrin) @ 1ml/L of water, T3 = Imitaf 20 SL (Imidacloprid) @0.5ml/L of water, T4 = Ripcord 10 EC (Cypermethrin) @1ml/L of water, T5 = Voliam Flexi 300 SC (Chlorantraniliprole + Thiamethoxam) @ 0.5 ml/L of water, T6 = Fame 70 WDG (Imidacloprid 60% + Acetamiprid 10%) @1gm/L of water, T7 = Capture 75 WDG (Imidacloprid 70%+Emamectin benzoate 5%) @0.5gm/L of water and T0= Untreated control were tested on mealybug. In laboratory, completely randomized design (CRD) with three replications was used. The color of the first, second and third instar nymphs are recorded as yellowish, grey brown with black and greenish respectively with their mean lengths and breadth 0.67±0.09 mm and 0.41±0.05 mm; 0.92±0.04 mm and 0.55±0.05 mm; 1.06±0.13 mm and 0.69±0.04 mm respectively. The crimsoncoloured adult male are 1.38±0.10 mm and 0.78±0.03 mm in length and width respectively. Adult female bugs are white colour, elliptical shape and body is covered with numerous minute hairs. Female bugs are 2.18±0.28 mm and 1.35±0.15 in length and width respectively. The longevity of first, second and third instar nymph are 49.33±2.52, 23.00±1.73 and 13.00±2.00 days where the longevity of adult male and female are 3.33±1.15 and 14.00±1.36 days respectively. Karate 2.5 EC (Lambda Cyhalothrin) was the most effective insecticide against mango mealybug which reduced maximum population of mango mealybug (93.67% after 12, 24, 36, 72 hours of spray followed by Voliam Flexi 300 SC (Chlorantraniliprole + Thiamethoxam) 93.25% after 12, 24, 36, 72 hours of spray.