Abstract:
An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural
University, Dhaka, Bangladesh during the period from October, 2020 to February, 2021 to
evaluate the effectiveness of some biorationals against leaf feeding insect pests of cabbage. The
experiment was laid out in a Randomized Complete Block Design (RCBD) with four
replications. Six treatments, viz. T
1
(Spinomax 45SC @ 0.5 ml/L of water at 7 days interval); T
(Biomax 1.2EC @ 2 ml/L of water at 7 days interval); T
(Bioneem plus 1EC @ 3 ml/L of water
at 7 days interval); T
4
ii
3
(Antario @ 2 g/L of water at 7 days interval); T
(Fytomax @ 2 ml/L of
water at 7 days interval) and T
6
5
(untreated control) were used. Among the management practices,
the lowest percentage of leaf infestation of cabbage by tobacco caterpillar (9.58%) and jute hairy
caterpillar (6.88%) was found in T
treated plot that reduced the highest leaf infestation over
control (72.73% and 68.67%, respectively); whereas the highest percentage infestation by
tobacco caterpillar (35.13%) and jute hairy caterpillar (21.96%) was found in untreated plot (T
1
).
The lowest mean incidence of tobacco caterpillar (5.74 larvae/6 plants) and jute hairy caterpillar
(4.15 larvae/6 plants) was found in T
that reduced highest incidence over control (49.52% and
58.95%, respectively); whereas the highest values of all these parameters were achieved from
untreated control treatment (T
6
1
). The lowest cabbage head infestation (23.64%) was recorded in
T
1
, that gave the highest yield of cabbage (75.80 t ha
-1
) that increased the highest yield over
control (96.93%). From the above study, it was found that the treatment T
comprised of
Spinomax 45SC @ 0.5 ml/L of water at 7 days interval gave the highest performance compared
to those of all other treatments used in the present study. Spinomax 45SC may be used for the
management of leaf feeding insect pests of cabbage.
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
