Abstract:
A research work was operated during the rabi season, the November, 2021 to March, 2022 in the
experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka, to
assess of some biopesticides against insect pests of chickpea and the effects on their natural
enemies. BARI chola-9 chickpea variety was selected as the test crop for this experiment. Eight
different treatments were considered and three times in a field setting that was comparable and
the experiment was set up using a Randomized Complete Block Design (RCBD).The treatments
are T
1
= Blue sticky trap +Bio-max M 1.2EC @ 1.0 ml/L of water at 7 (Seven) days interval; T
2
= Yellow sticky trap + Imitaf 20SL @ 1.0 ml /L of water at the 7 (Seven) days interval; T
3
=
Yellow sticky trap + Spinomax @ 2.0 ml/L of water at 7 (Seven) Days interval; T
4
= Field
sanitation + Bio Bt k @ 0.5gm/L at 7 (Seven) days interval; T
5
= Fytomax N @ 5ml/L of water
at 7 (Seven) days interval; T
6
= Field sanitation + pheromone trap @ 1 trap/plot at 30 (Thirty)
days interval; T
7
= Spraying HNPV@ 0.3gm/L of water at 7 (Seven) days interval; T
0
=
Untreated control. According to treatment performance, the lowest pest infestation was observed
in T
2
(7.57/ leaf/plant, 7.24/leaf/plant) and T
3
(3.44/10plants, 3.34/5m
2
) treatments against
sucking pests (aphid, whitefly) and lepidopteran pests (chickpea pod borer, tobacco caterpillar)
of chickpea respectively. T
2
and T
3
treatments were most effective against sucking and the
lepidopteran insect pests of chickpea. In natural enemies, the maximum number of lady bird
beetle and predatory spider (11.66/5m
2
and 8.00/ 5m
2
) was recorded from T
3
treatment. In
addition, the maximum reduction over control in case of plant and pod infestation were found in
T
3
treatment (64.52% and 84.68% respectively) whereas the minimum reduction were (17.48%
and 25.42% respectively) in T
5
Treatment. In term of yield of chickpea, the maximum yield
(2.35 t/ha) was recorded from T
3
treatment and followed by T
1
(2.19 t/ha) treatment. So, it can be
summarised that treatment T
3
(Yellow sticky trap + Spinomax @ 2.0ml/L of water at 7 (Seven)
days interval) was more successful than the other treatments and T
1
came after it.
Description:
A Thesis
Submitted to the Department of Entomology
Sher-e-Bangla Agricultural University, Dhaka, in partial
fulfillment of the requirements For the degree of
MASTER OF SCIENCE
IN
ENTOMOLOGY
