Abstract:
The experiment was conducted in the central farm of Sher-e-Bangla Agricultural
University, Sher-e-Bangla Nagar, Dhaka during the period from September,
2017 to May, 2018 to assess the incidence and damage severity of chewing
insect pests and fruit fly on bottle gourd and their managements. BARI Lau 4
were used as the test crop for this study. The experiments consists of different
management practices as treatment and they were T
1
: Mechanical and Cultural
practices at 7 days interval, T
2
: Field sanitation + Spraying Sevin 85 SP @ 1.5
g/L of water at 7 days interval, T
3
: Spraying Folithion 50 EC @ 1.12 ml/L of
water at 7 days interval, T
4
: Mechanical control + Spraying Rogor 40 L @ 1.0
ml/L of water at 7 days interval, T
5
: Spraying Dizol 60 EC @ 1.0 ml/L of water
at 7 days interval, T
6
: Field sanitation + Spraying Proclaim 5 SG @ 1.0 g/L of
water at 7 days interval and T
7
: Untreated control. The experiment was laid out
in a Randomized Complete Block Design (RCBD) with three replications. Red
pumpkin beetle, epilachna beetle, green leaf eating caterpillar, cutworm,
grasshopper and fruit fly were observed during the study period. At vegetative
and reproductive stage, the lowest leaf infestation (3.49% and 5.38%) was
observed from T
4
treatment, whereas the highest infestation (15.56% and
15.02%) in T
7
treatment. In number and weight basis at early, mid and late
fruiting stage the lowest fruit infestation (2.67% and 4.40%, 2.22% and 5.97%,
3.13% and 5.13%) was observed from T
4
treatment, whereas the highest
infestation (10.65% and 10.53%, 10.15% and 16.24%, 11.92% and 14.54%) in
T
7
treatment. The highest healthy fruit yield (69.96 t/ha) was recorded from T
4
,
whereas the lowest (57.32 t/ha) from T
7
treatment. From the above findings it
can be concluded that among the treatments, T
4
(Mechanical control + Spraying
Rogor 40 L @ 1.0 ml/L of water at 7 days interval) may be revealed as the best
treatments in respect of higher healthy fruit yield by reducing leaf and fruit
infestation of bottle gourd.
