Abstract:
An experiment was conducted at the central farm of Sher-e-Bangla Agricultural University,
Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the effect of some botanicals and
biocontrol agent on insect pests of brinjal (Solanum melongena L.) (BARI Begun-7) for its
quality production during the period from October 2021 to April 2022. The experiment was laid
out in Randomized Complete Block Design (RCBD) with three replications. Seven treatments,
viz. Treatment were T
1
: Neem oil @ 4ml/L of water at 7 days interval; T
: Neem seed kernel @
300g/L of water at 7 days interval; T
3
ii
2
: Sanitation + Trichogramma evanescens at the rate of 1
card/plot at weekly interval (1000 eggs per card); T
: Braconid wasps at the rate of 20-25/plot at
weekly interval + field sanitation; T
5
4
: Bacillus thuringiensis serovar kurstaki @ 1ml suspension
/L of water + Safeclean 2.5 ml/L of water at 7 days interval; T
: Botanical pesticides Safeclean
5 ml/L of water at 7 days interval; T
7
6
: Untreated control was included in this study. In case of
different treatments performance, T
(Bacillus thuringiensis serovar kurstaki @ 1ml suspension
/L of water + Safeclean 2.5 ml/L of water at 7 days interval) showed the best results in terms of
incidence of brinjal shoot and fruit borer, number of Jassid plant
number of Epilachna beetle plant
-1
5
, number of Whitefly plant
-1
-1
, number of Aphid plant
, yield of healthy and infested
fruit, yield contributing characters and yield (t/ha) of brinjal. In term of yield of total fruits, the
highest yield of total fruits (50.96 t/ha) was obtained from in T
treatment which was closely
similar with others treatment except untreated control. There was negative relationship present
5
in number of brinjal shoot and fruit borer, Jassid, Aphid, Epilachna beetle, Whitefly and fruit
infestation in number basis with the yield of brinjal, i.e. when the average number of brinjal
shoot and fruit borer was increased the yield of brinjal was decreased. Same correlation found
for average number of Jassid, Aphid, Epilachna beetle, Whitefly. From the study, it may be
concluded that treatment T
(Bacillus thuringiensis serovar kurstaki @ 1ml suspension /L of
water + Safeclean 2.5 ml/L of water at 7 days interval) was the most efficients than others
treatment for the effect of some botanicals and biocontrol agent on insect pests of brinjal
(Solanum melongena L.) for its quality production which was followed by spraying of T
5
(Botanical pesticides Safeclean 5 ml/L of water at 7 days interval) treatment.
Description:
A Thesis
Submitted to the Institute of Seed Technology,
Sher-e-Bangla Agricultural University, Dhaka,
In Partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
SEED TECHNOLOGY