Abstract:
The present study on integrated management package of sweet potato weevil infesting
sweet potato was conducted during rabi season (Nov-2017 to Mar-2018) in the
experimental field of Department of Entomology at Sher-e-Bangla Agricultural
University, Dhaka. The variety of sweet potato BARI Mistialu-8 was used as test crop.
The experiment consisted of six treatments and one untreated control, they are T
1
: Sex
pheromone trap + Earthing up one time + Mulching (straw) + One irrigation, T
2
: Sex
pheromone trap + Earthing up two times + Two light irrigation , T
3
: Sex pheromone trap
+ Earthing up three times + Three light irrigation, T
4
: Earthing up two times + Sevin
85WP @ 3g\L of water at 15 days interval (2 times application), T
5
: Earthing up two
times + Diazinon 10G @ 15 kg\ha (one time soil application), T
6
: Earthing up two time
+ Fenthion 2ml\L of water, T
7
: Untreated control. The experiment was laid out in
Randomized Complete Block Design (RCBD) with three (3) replications. The result
revealed that sex pheromone trap with earthing up three times and three light irrigation
(T
3
) showed the best control measure against sweet potato weevil compared to other
treatments. Highest number of sweet potato weevil adult was found in T
7
(9.46
weevil/plot) and highest damage result was observed in T
7
(15.4%). Whereas the lowest
number of adult weevil was observed in T
3
(0.392 weevil/plot) and lowest damage was
noticed in T
3
(5.04%). At 15 days early harvest, in consideration of infestation level of
storage tubers in number and weight basis, the lowest infestation was recorded from T
3
(3.68% and 5.68%), whereas the highest infestation (12.24% and 12.98%) was observed
in T
7
. At optimum days harvest, for infestation level of tubers in number and weight
basis, the lowest infestation was recorded from T
3
(4.49% and 6.48%), whereas the
highest infestation (13.55% and 14.15%) was observed from T
7
treatment. After 15 days
from optimum harvest, in case of infestation level of tubers in number and weight basis,
the lowest infestation was recorded from T
3
(5.32% and 6.92%), whereas the highest
infestation (16.35% and 17.04%) was observed from T
7
treatment. Besides, highest
deformed tuber was found in T
7
(11.960%) and lowest in T
3
(2.362%). The highest yield
was recorded from T
3
(41.87 t/ha), whereas, the lowest from T
7
(30.28 t/ha) treatment.
These findings illustrated that, the Sex pheromone trap with earthing up three times and
three light irrigation (T
3
) treatment was more effective for controlling of sweet potato
weevil.
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, 2018