BIORATIONAL MANAGEMENT OF SUCKING INSECT PESTS OF OKRA

Abstract

The study was conducted to investigate biorational management of sucking insect pests of okra in the research field of Sher-e-Bangla Agricultural University, Dhaka during the period from October, 2020 to February 2021. The experiment consisted of the management practices (T 1 = Spinosad @ 0.5 ml/L of water; T = Matrine @ 1.0 ml/L of water; T 3 = Thiamethoxam @ 0.2 g/L of water; T ii 4 2 = Neem oil @ 5.0 ml/L of water with detergent; T 5 = Abamectin @ 1.0 ml/L of water; T = Buprofezin @ 0.2 g/L of water and T 7 6 = Untreated control) are applied at 7 days interval. The experiment was designed with Randomized Complete Block Design (RCBD) with three replications. Data on different pest incidence level of infestation, yield attributes and yield were collected and recorded. At total fruiting stage, in number basis, considering the % fruit infestation, the lowest infested fruits per plant were recorded from Buprofezin @ 0.2 g/L of water (33.62%), while the highest infested fruits were recorded in control (44.21%). The lowest plant infestation was found from Buprofezin (34.25%), whereas the highest infested plants were recorded in untreated control (46.33%). The tallest plant was recorded from neem oil (244.9 cm), while the shortest plant was found from Spinosad (195.2 cm). The highest yield of fruits was observed from Buprofezin @ 0.2 g/L of water at 7 days interval (15.59 ton/ha), while the lowest yield per hectare was found from control (11.36 ton/ha). Among the treatments, Buprofezin @ 0.2 g/L of water at 7 days interval was more effective for the controlling of insect pests as well as highest yield contributing characters and yield of Okra.