Abstract:
The experiment was conducted at the central farm of Sher-e-Bangla Agricultural
University, Sher-e-Bangla Nagar, Dhaka, Bangladesh to evaluate the performance of
different management practices in controlling major insect pests of country bean (BARI
seem-3) during the period from June to December, 2012. The experiment consists of the
following management practices: T0: Untreated control; T1: Hand picking of infested
plant parts at 7 days interval; T2:Release of Trichogramma evanescence@ 0.5 g/6 m2 at
15 days interval T3:Spraying of neem oil @ 4ml/L of water at 7 days interval ; T4:
Spraying of neem oil @ 4ml/L of water + Hand picking of infested plant parts at 7 days
interval and T5: Spraying of neem oil @ 4ml/L of water and hand picking of infested
plant parts at 7 days interval + Release of Trichogramma evanescence @ 0.5 g/6m2 at 15
days interval. The experiment was laid out in Randomized Complete Block Design
(RCBD) with three replications. In consideration of total growing period by number the
% pods infestation, the lowest infested pods plant-1 by number was observed from T5
(7.13%), where the highest pod infestation was found from T0 (21.63%), % pod
infestation in weight, the lowest infested pods plant-1 was observed from T5 (7.09%),
whereas the highest in T0 (21.40%). The highest no. of inflorescence plant-1 was observed
from T5 (37.00) while the lowest no. was observed from T0 (31.50) treatment. The
highest yield hectare-1 was found from T5 (15.97 ton), while the lowest yield hectare-1
was found from T0 (10.71 ton) treatments. The pod yield of country bean was highly
significant (p=0.01), strong (r=0.982) and negatively correlated with pod infestation by
number i.e., the yield was decreased with the increase of pod infestation by number.
Considering the controlling of country bean insect pests with some control options where,
highest benefit cost ratio (4.21) was recorded in the treatment T5 and the lowest benefit
cost ratio was recorded from T1 (1.32). The pod yield of country bean was highly
significant (p=0.01), strong (r=0.977, r=0.813, r=0.981, r=977) and positively correlated
with no. of pods inflorescence-1, pod length, no. of inflorescence plant-1, no. of flower
inflorescence-1 i.e., the yield was increased with the increase of pods inflorescence-1, pod
length, no. of inflorescence plant-1, no. of flower inflorescence-1. From the study, it may
be concluded that treatment T5 which comprised with the spraying of neem oil @ 4ml/L
of water and hand picking of infested plant parts at 7 days interval + Release of
Trichogramma evanescence @ 0.5g/6m2 at 15 days interval was more effective among
the management practices for controlling majot insect pests of country bean which was
followed by spraying of neem oil @ 4ml/L of water +Hand picking of infested plant parts
at 7 days interval.
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
SEMESTER: JANUARY-JUNE, 2013