Abstract:
The experiment was conducted in the field of Sher-e-Bangla Agricultural
University farm, Sher-e-Bangla Nagar, Dhaka during the period from November
2013 to April 2014 to study the effects of different planting dates and mechanical
support for the management of insect pests in tomato. BARI Tomato 5 was used
as planting material. The experiment was consisted of nine treatments. These were
as follows- T1: Planting at 25 November + No support; T2: Planting at 25
November + Horizontal mechanical support; T3: Planting at 25 November +
Vertical mechanical support; T4: Planting at 10 December + No support; T5:
Planting at 10 December + Horizontal mechanical support; T6: Planting at 10
December + Vertical mechanical support; T7: Planting at 25 December + No
support; T8: Planting at 25 December + Horizontal mechanical support and T9:
Planting at 25 December + Vertical mechanical support. The experiment was laid
out in Randomized Complete Block Design (RCBD) with three replications. In
case of white fly, at the entire growing season, minimum number of white fly
plot-1 (16.67) was recorded from the treatment T5, whereas the maximum (33.73)
from the treatment T7. For tomato fruit borer, at entire growing season, minimum
number of fruit borer plot-1 (8.40) was recorded from the treatment T5, whereas
the maximum (20.93) from the treatment T7. At early fruiting stage of tomato in
number and weight basis, the highest percentage of infested fruit (10.65% and
10.99%) was recorded in T7 treatment, while the lowest (2.67% and 4.35%) in T5
treatment. At mid fruiting stage of tomato in number and weight basis, the highest
percentage of infested fruit (11.92% and 12.62%) was recorded in T7 treatment,
while the lowest (3.13% and 4.50%) in T5 treatment. At late fruiting stage of
tomato in number and weight basis, the highest percentage of infested fruit
(10.15% and 10.66%) was recorded in T7 treatment, whereas the lowest (2.22%
and 4.21%) in T5 treatment. At total fruiting stage of tomato in number and weight
basis, the highest percentage of infested fruit (10.93% and 11.43%) was recorded
in T7 treatment, whereas the lowest (2.66% and 4.35%) in T5 treatment. The
highest fruit yield (55.91 t ha-1) was recorded in T5, whereas the lowest yield
(45.39 t ha-1) in T7 treatment. Planting at 10 December + Horizontal mechanical
support was more effective for reduction of insect pest of tomato and also for
highest yield.
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: JULY-DECEMBER, 2014