Abstract:
The experiment was conducted at the central farm of Sher-e-Bangla Agricultural
University (SAU), Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the potential
of some biorational insecticides in controlling bean aphid of country bean (BARI seem1)
during
the
period
from
October
2019
to
February
2020.
The
experiment
consists
of
the
following
management
practices:
T
1
: Azadirachtin (Bioneem plus 1 EC) + Spinosad
(Success 2.5 SC); T
2
: Thiamethoxam (Aktara 25% WG) + Spinosad (Success 2.5 SC);
T
3
: Imidacloprid (Imitaf 20 SL) + Spinosad (Success 2.5 SC); T4: Farmers’ practice
(spraying Malathion 57 EC weekly); T5: Control. The experiment was laid out in a
Randomized Complete Block Design (RCBD) with four replications. In consideration
of total growing period, the %pod infestation by number, the lowest number of infested
pods plant
-1
was observed from T
3
(7.65), whereas the highest pod infestation was found
from T
5
(17.75). The highest no. of healthy inflorescence plant
ii
-1
was observed from T
3
(55.75) while the lowest no. was observed from T
5
(39.00) treatment. The highest yield
hectare
-1
was found from T
3
(21.25 ton/ha), while the lowest yield hectare
was found
from T
5
(16.675 ton/ha) treatments. From this study it may be concluded that the
treatment T
3
which consists of spraying of Imitaf 20 SL @2 ml/L of water at weekly
interval and Success 2.5 SC @0.1 ml/L of water at alternate week was more effective
among the management practices for controlling bean aphid of country bean which was
followed by spraying Aktara 25% WG @0.5 g/L of water at weekly interval and
Success 2.5 SC @0.1 ml/L of water at alternate week.
Description:
A Thesis
Submitted to the 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
