Abstract:
Field experiment was conducted to evaluate the effect of some selected insecticides
on brinjal shoot and fruit borer (BSFB) (Leucinodes orbonalis Guenee) and
arthropod biodiversity in the brinjal agroecosystem at Sher-c-Bangla Agricultural
University (SAU) farm during November, 2007 to April, 2008. Fifteen species of
harmful arthropods under 15 families from 6 different orders were recorded in
brinjal agroecosystem. Among them BSFB, jassid, aphid, white fly and epilachna
beetle were found as the most common insect pcst of brinjal. Coleoptera was the
most common order of plant dwelling predatory insects, which occupied 5 1.17% of
the total predators. Surface dwelling arthropods caught in pitfall traps were grouped
into 17 families, among them, Formicidac ranked Lop followed by Lycosidae. Six
treatments comprising insecticides viz., carbosulfan 20EC. cartap 50SP,
cypermethrin IOEC, chlorpyriphos 20EC, flubendiamide 24WG and an untreated
control were tested. The experiment was laid out in Randomized Completely Block
Design (RCBD) with 3 replications. Among the treatments carbosulfan showed the
best efficacy providing more than 80% reduction of fruit infestation and gavc
highest healthy fruit yield (20.29 tiha) of brinjal. Almost similar results were
obtained by application of flubendiamide against brinjal shoot and fruit borer attack
Carbosulihu, cypermethrin and chiorpyriphos had strong negative effect and cartap
had moderate impact on the plant dwelling predaceous arthropods. Flubendiamide
had minimum impact on both plant and surface dwelling predaccous arthropods in
the brinjal agroccosystem.
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka-1207
in partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE (M.S.)
IN
ENTOMOLOGY
