Abstract:
The experiment was conducted to study the potential management against incidence and damage
severity by major insect pests of french bean during the period January, 2021 to April, 2021. The
experiment consisted of six different treatments viz T
1
= Spraying Bio-neem plus botanical
insecticide @ 0.5 ml/L at the 7 days intervals; T
2
= Larval parasitoid + Bamper 20SL (Imidacloprid)
@ 0.5 ml/L at the 15 days intervals; T
3
=Field sanitation + Shobicron 425EC (profenofos +
cypermethrin) @ 2ml/L at the 15 days intervals; T
4
=Actara 25WG (Thiamethoxam) @ 0.3g/L at
the 15 days intervals; T
5
= Larval parasitoid + Yellow sticky board traps; and T
6
= Untreated
control. The design of experiment was randomized complete block design (RCBD) with four
replications. Bean pod borer, jassid, whitefly, aphid, winged black aphid and epilachna beetle were
found in infest french bean. Among different treatments, T
3
showed the best performance followed
by T
2
treatment, whereas the lowest performance in T
6
(Untreated control) for controlling
incidence and infestation of major insect pests of french bean. At the vegetative and reproductive
stage of French bean, the lowest percent of infestation in case of aphid (16.03 and 10.59%), jassid
(8.95 and 11.51%), whitefly (2.59 and 6.70%) and winged black aphid (4.84 and (9.08%) were
recorded in T
3
treatment, whereas the highest in T
6
(59.76 and 30.35%, 48.15 and 48.54%, 11.98
and 22.32%, 18.64 and 25.73%) treatment respectively. In case of bean pod borer, the highest %
of infestation reduction over control at the early, mid and late reproductive stages of french bean
in number basis (83.28, 77.11 and 77.76) and in weight basis (74.70, 76.14 and 80.89) in T
3
treatment, whereas the lowest in T
6
(54.49, 55.52, 54.98 and 53.34, 61.86, 68.89) treatment
respectively. The overall result indicates that, the order effectiveness of the potential management
practices against incidence and damage severity of major insect pests of french bean was T
3
>
T
1
> T
4
> T
5
> T
6
.
Description:
A Thesis
Submitted to Department of Entomology,
Faculty of Agriculture.
Sher-e-Bangla Agricultural University,
Dhaka-
In partial fulfillment of the requirements for the degree of
MASTERS OF SCIENCE (MS)
IN
ENTOMOLOGY
