Abstract:
The experiment was conducted at the central farm of Sher-e-Bangla Agricultural
University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to study the insect pest
incidence in mungbean and their management. BARI Mung-5 was used as the test
crop of this experiment. The experiment consists of the following treatments: T1:
Sevin 85 WP @ 2.5 gm/L of water at 15 days interval; T2: Dursban 20 EC @ 2.0
ml/L of water at 15 days interval; T3: Sumi Alpha 5 EC @ 1.0 ml/L of water at 15
days interval; T4: Actara @ 0.5 gm/L of water at 15 days interval; T5: Marshal 20
EC @ 2.0 ml/L of water at 15 days interval; T6: Neem seed kernel extract @ 20
gm/L of water at 15 days interval and T7: Untreated control. The experiment was
laid out in Randomized Complete Block Design (RCBD) with three replications.
The lowest stemfly infestation (4.50%), lowest stem tunneling (6.22%) and lowest
number of stemfly larvae/pupae (0.25) was recorded from T5 (Marshal 20 EC @
2.0 ml/L of water), whereas the highest stemfly infestation (22.50%), highest stem
tunneling (19.71%) and highest number of stemfly larvae/pupae (2.17) was found
from T7 (untreated control) treatment, respectively. The lowest number of jassid
per 10 leaves (1.36), lowest number of whitefly per 10 leaves (1.20), lowest
number of hairy caterpillar per plant (1.00), lowest number of thrips per 10
flowers (1.20) was found from T5 (Marshal 20 EC @ 2.0 ml/L of water), while the
highest number of jassid per 10 leaves (9.78), highest number of whitefly per 10
leaves (5.67), highest number of hairy caterpillar per plant (4.10) and highest
number of thrips per 10 flowers (5.40) was observed from T7 (untreated control)
treatment, respectively. At early, mid and late stage, the highest percent of
infested pods plant-1 in number (11.86%, 15.02% and 17.02%) was recorded in T7
(untreated control) treatment again, the lowest infestation percent in number
(3.94%, 5.38% and 5.68%) was recorded in T5 (Marshal 20 EC @ 2.0 ml/L of
water) treatment, respectively. The highest yield per hectare (1.78 ton) and highest
benefit cost ratio (2.65) was found in T5 (Marshal 20 EC @ 2.0 ml/L of water)
treatment, whereas the lowest yield per hectare (1.33 ton) and lowest benefit cost
ratio (1.04) in T7 (untreated control). Marshal 20 EC @ 2.0 ml/L of water was
more effective among the management practices for controlling insect pest of
mungbean which was followed by Dursban 20 EC @ 2.0 ml/L of water and Neem
seed kernel extract @ 20 gm/L of water.
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
IN
ENTOMOLOGY
SEMESTER: JANUARY-JUNE, 2013