Abstract:
Tomato fruit borer is one of the most harmful insect in our country. This is mostly
control by the chemical insecticides, which are available in the market. But the present
investigation was undertaken for the evaluation of some management practices against
tomato fruit borer. The experiment included 5 treatments T
1
: flubendiamide (Belt 24
WG), T
2
: spinosad (Success 2.5 SC), T
3
: emamectin benzoate (Proclaim 5G), T
4
:
Farmer’s practice (Cypermethrin 10 EC); T
5
: Control (no pesticides). Sprayings was
done at 7 days interval. The field experiment was laid out in Randomized Complete
Block Design (RCBD) with three replications. Data on number of healthy and infested
fruits/plant, weight of healthy and infested fruits/plant, weight of single fruit/plant,
diameter of single fruit/plant, yield per plot and healthy and infested yield per hectare
were recorded and at last economic analysis was done. The treatment of flubendiamide
(Belt 24WG) was the highest (30.23) number of healthy fruits/plants the control T
5
gives the least (8.93) fruits/plant. Control treatment shows the highest level of
infestation which was significantly different from all other treatments. The lowest
(1.23) number of infested fruits/plant was found at early stage in Farmer’s practice
(Cypermethrin 10 EC) and highest (4.83) for control treatment. T
5
shows the highest
level of infestation. At early fruiting stage, the lowest infestation percentage (3.11%)
was recorded from flubendiamide (Belt 24 WG) treatment which was significantly
different from all other treatments. On the other hand, the highest (26.19%) infestation
percentage was recorded from control treatment. The highest (165.11g) fruit weight
was observed for flubendiamide (Belt 24 WG) and the lowest (63.9g) for control
treatment. The highest (13.8mm) fruit diameter was observed for flubendiamide (Belt
24 WG) and the lowest (5.9mm) for control treatment. The highest (10.86 t/ha.) yield
was observed for the treatment flubendiamide (Belt 24 WG) and the lowest (7.79 t/ha.)
yield was observed for control treatment. Considering the control of tomato fruit borer,
the highest benefit cost ratio was 1.79 recorded from emamectin benzoate (Proclaim
5G). The benefit cost ratio was due to application of the different management practices
against tomato fruit borer was T
3
> T
4
> T
2
ii
> T
1
> T
5.
Number of recorded natural
enemies was relatively low in pesticide treated plots in compare with untreated control.
Description:
A Thesis
Submitted to the Department of Entomology
Sher-e-Bangla Agricultural University, Dhaka, in partial
fulfillment of the requirements
for the degree
of
MASTER OF SCIENCE
IN
ENTOMOLOGY