Abstract:
The present study was conducted in the experimental field of Sher-e-Bangla
Agricultural University to find out the efficient as well as risk free management
practice(s) of cucurbit fruit fly infesting bitter gourd cultivated during Kharif I
season (March 2017 to June 2017). There were five treatments. These were as
follows T
1
= Spinosad, T
2
= Neem oil, T
3
= Poison bait trap, T
4
= Black seed oil,
T
5
= Untreated control. The treatments :T
1
comprised of Spraying of spinosad @
.08 ml liter
-1
of water at 7 days interval , T
2
comprised of Spraying of neem oil @
3ml and 10 ml Trix mixed with 1 liter of water 7 days interval, T
3
comprised of
setting up of poison bait trap @ 2 gm Sevin 85 WP mixed with 100 g mashed
sweet gourd and 10 ml molasses and replaced at 4 days interval, T
4
comprised of
black seed oil @ 5 ml with 10 ml Trix mixed with 1 liter of water applied at 7 days
interval, T
5
comprised of Untreated control. The experiment was laid out in
Randomized Complete Block Design (RCBD) with four replications. Poison bait
trap (T
3
) produced the highest number of fruit at early (27.23 fruit/plot), mid
(38.89 fruit/plot) and late (28.00 fruit/plot) fruiting stages; and reduced the
maximum fruit infestation over control at early (93.66%), mid (91.63%) and late
(85.44%) fruiting stage. Percent fruit infestation by weight at early (10.95%), mid
(9.04%) and late (18.76%) and reduced maximum fruit infestation over control at
early (83.79%), mid (81.27%) and late (78.65%) was also obtained in T
3
treated
plot. The highest yield (24.03 t/ha) was recorded in T
3
which provided the highest
yield (163%) over control. The highest benefit cost ratio (43.20) was also found
from T
3
treated plot and the lowest BCR (14.91) obtained from T
5
Considering the social acceptance and environmental safely point of view, T
3
poison bait trap was the most effective management practices in reducing the fruit
fly infestation and thereby increasing the yield of bitter gourd.
treated plot.
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfilment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
ENTOMOLOGY
SEMESTER: JANUARY-JUNE, 2018
