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.
