INCIDENCE OF INSCT PESTS AND THEIR INTEGRATED MANAGEMENT ON SOYBEAN

Abstract

To observe the insect pest complex and population dynamics of some major insect pests on soybean and to develop their integrated management practices two field experiments were conducted at experimental field of Sher-e-Bangla Agricultural University (SAU) during July 2012 to June 2013 in Randomized Complete Block Design (RCBD) with three replications. Insect pest complex and population dynamics of five major insect pests were recorded from unsprayed field. Effectiveness of plant materials, chemical insecticides, plant hormones and integrated pest management techniques were evaluated based on the incidence of insect pests and yield of soybean. Nineteen (19) insect pests of sixteen (16) families under six (6) orders were recorded from soybean field. Leaf beetle and semilooper were found as major leaf feeding, and aphid, jassid and whitefly were observed as major sucking insect pests of soybean. Incidence of these insect pests increased with the increasing of temperature, humidity and age of the crop and reached in peak at 40-50 days after sowing and then declined with age of the crop. Among the plant materials neem oil showed the best performance against leaf feeding and sucking insect pests and produced highest yield. Carbosulfan gave the best result in reducing insect pests and increasing yield of soybean over control. Among the IPM techniques, Plant Revitalization Hormone (PRH) alone showed the better performance in reducing insect pests and increasing yield of soybean than Carbosulfan, neem oil and/or combined use of them. Although Carbosulfan gave the best effectiveness for the management of soybean insect pest neem oil or PRH may be included as a component of integrated pest management for soybean from health hazard and environmental safety point of view.