Abstract:
A field experiment was conducted to study the management of insect pests of
groundnut by biorational pesticides. BARI Chinabadam-8 was used as the test crop
for the experiment to evaluate the treatments’ effect on insect pests. Eight treatments
were applied at 10 days interval viz. T
1
: Neem seed kernel @5 g/L of water, T
:
Spinosad @0.5 mL/L of water, T
3
: Buprofezin @0.2 g/L of water, T
: Lufenuron
@0.2 g/L of water, T
5
: Emamectin Benzoate @1.0 mL/L of water, T
: Lamda
cyhalothrin @1 mL/L of water + Biotrin @1 mL/L of water, T
: Actara @ 0.5 g/L of
water + Ecomec 1.8 EC @1 mL/L of water and T
8
7
: Untreated control. Available
insect pests namely aphid, whitefly, hairy caterpillar, thrips and jassid were found in
the study field. Spinosad @0.5 mL/L of water at 10 days interval (T
) showed best
performance in reducing aphid and hairy caterpillar population, also their infestation.
Treatment T
effectively reduced the whitefly population. For reducing thrips
population, treatment T
6
7
showed best performance. Similarly T
2
with T
worked best
against jassid population. Highest number of all available insect pest population was
found in the untreated control plot. Treatment T
also showed the best results on yield
and yield contributing characteristics viz. maximum pod/plant (22.17) and yield (2.69
t/ha) . The minimum pod/plant (11.20) and lowest yield (1.31 t/ha) was obtained from
the untreated control plot, T
8
2
. From the study, a strong negative relationship between
available insect population and yield of groundnut was found.
Description:
A Thesis
Submitted to the Department of Entomology
Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
ENTOMOLOGY
