STUDY ON THE INCIDENCE OF MAJOR INSECT PESTS OF SOYBEAN AND THEIR MANAGEMENT

Abstract

The experiment was conducted at the experimental Field of Sher-e-Bangla Agricultural University, Dhaka during the rabi season from November, 2010 to March. 2011 to study on the major insect pest of soybean and their management. The experiment comprised with seven different insecticides including control treatment viz. Marshal 20EC @ 3mlfL water; Semcap 50EC @ 3m1/L water; Dursban 20EC @ 3ml/L water; Basathrin IOEC @ lml/L water, Fiter 2.5EC@ I mulL water, Sobicom 42513C @ 2 mt/fl. water, Aktara 5G @ 3 mg//L water, Control were used in this study. Soybean var. Shohag was included in this study. A single factor experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Result revealed that the lowest number of aphid, jassid. whitefly, thrips and pod borer was recorded from T1 (Marshal 20EC @ 3mlIL water) while the height number was in untreated control treatment (TO. The height percent reduction of aphid, jassid, whitefly, thrips and pod borer population over control was also recorded from T1 treatment (use of Marshal 20EC @ 3mlIL water ) as compared to other treatment. The yield of soybean per plot was the height (1.10kg) in T1 (Marshal 20EC @ 3mlIL water) treated plot and lowest yield controled treatment. Similarlay the yield of soybean per hectare was also the height (Il .00 ton) in T, treated plot followed by T7 treated plot and lowest was in controlled treatment (Tg). The findings of present study indicated that Marshal 20EC ® 3mVL water could be used to reduce the incidence of major insect pest of soybean as well as to increase the yield of soybean.