COMPARING INCIDENCE AND INFESTATION OF INSECT PESTS IN BT AND NON-BT BRINJAL AND THEIR CHEMICAL MANAGEMENT

Abstract

This study compared the incidence and infestation of the major insect pests and their susceptibility to insecticides in two different genotypes of brinjal; BARI Bt brinjal 2 and BARI brinjal 4. The experiment was conducted on central farm of Sher-eBangla Agricultural University, Dhaka in rabi season 2017-18. The experiment used

a

completely randomized 2 x 4 factorial design, with four replications. The first factor refers to the corresponding Bt and non-Bt brinjals, and the second factor refers to the different chemical treatments (imidacloprid 0.5 mlL -1 water, Spinosad 0.4 mlL -1 water, malathion 2 mlL -1 water and control). Both the varieties showed lower infestation in vegetative stage and peak infestation in reproductive stage. Results revealed that the lowest population of sucking pests such as jassid, aphid and whitefly (6.41, 8.22, 6.52 and 10.8, 8.33, 8.45 per six leaves at vegetative and fruiting stage respectively) occurred in non-Bt brinjal and from imidacloprid. Spinosad and Bt brinjal showed higher efficiency in controlling epilachna beetle and brinjal shoot and fruit borer (1.25 plants -1 , 0.93% and 1.31 plants , 2.71% in shooting and fruiting stage respectively). So, imidacloprid and spinosad can be used in controlling sucking pests and chewing pests of brinjal respectively.