Abstract:
The present study was carried out in the laboratory of Entomology Department and in
the central farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh in order
to conduct biological study of two spotted spider mite pests attacking brinjal and
bitter gourd. Also studied the effectiveness of entomopathogenic fungi (Trichoderma
sp), some botanicals and biopesticides (neem oil, mehagany oil, spinomax, biomax)
and common insecticide (Ripcord) for the eco-friendly management of the pests. The
experiment consisted of seven treatments and was laid in a single factor Randomized
Complete Block Design (RCBD) with three replications. Mite pests were present in
both brinjal and bitter gourd field. Adult mite was reared in laboratory, the female laid
translucent eggs and the incubation period lasted for 1-3 days. The larval period
ranged from 2 to 3 days and measured 183.43 ± 3.71 µ in length and 130 ± 2.70 µ in
width. There were three resting stage during the life cycle of mite pests. First resting
stage is called protochrysalis from which protonymph arised which was measured
243.72 ± 5.81 µ in length and 159.92 ± 4.65 µ in width. Second resting stage is
deutochrysalis; the deutonymph emerged from deutochrysalis which was 382.54 ±
4.40 µ in length and 228 ± 3.6 µ width. Finally after the third resting stage which is
called teleochrysalis, adult male and female emerged. Eventually different biorational
control tactics, treatments showed varied response against mite pests. Trichoderma
spp. showed the best result which was followed by Neem oil against mite pests
infesting brinjal and bitter gourd field. The results showed that the total number of
fruit set, % healthy fruit and infested fruit was higher with the treatment of
Trichoderma spp. In most cases, except control treatment, ripcord showed the worst
results against mite pests.
Description:
A Thesis
Submitted to the Faculty of Agriculture, Dept. of Entomology
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
ENTOMOLOGY