Abstract:
The experiments were conducted to study the status of farmers practices for combating
insect & mite pests of jute and develop an IPM package utilizing bio- control agent and
neem products in three extensive jute growing areas of Bangladesh and the experimental
farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from March to
August 2011. Field survey in three intensive jute growing areas viz., Tangail, Jamalpur
and Manikgonj was conducted to identify the present status of farmers practices for
combating insect & mite pests of jute. The following treatments were applied during
develop an IPM package utilizing bio-control agent and neem product T1= Green neem
leaf extract @ 1:20 at 7 days interval; T2= Dry neem leaf extract @ 1:20 at 7 days; T3 =
Neem oil 5ml/ litre of water at 7 days interval; T4 = Neem seed karnel @ 200 g/L of
water at 7 days interval; T5 = Trichogramma evanescense @ 0.5 gm/6m2 at 7 days
interval; T6 = Trichogramma evanescense @ 0.5 gm/6m2 + Neem oil 5 ml/L of water at
7 days interval; T7 = Untreated control. According to the opinion of the respondent
farmers collected from three intensive growing areas, jute hairy caterpillar, jute
semilooper, weevil and mite were recorded as the major insect and mite pests of jute.
Survey data revealed that the highest (14.25%) plant infestation was recorded for jute
hairy caterpillar and the lowest (5.75%) was for jute weevil. The highest yield loss
(23.00%) was recorded for jute hairy cater pillar and the lowest (11.00%) was for jute
weevil. Considering economic loss, the highest (31.00%) economic loss was obtained for
jute hairy caterpillar, while the lowest (14.00%) was weevil. During the development of
IPM package the treatment that applied in consideration of % mortality of Jute hairy
caterpillar, Jute semilooper, Jute weevil and Jute mite after 24, 48 and 72 hours where
the highest mortality was recorded from T6 while the lowest mortality was recorded
fromT5. By using bio-control agents and different neem products the highest yield (2.81 t
ha-1) was recorded from T6, while the lowest yield (1.82 t ha-1) from T7. The highest
benefit cost ratio (3.34) was estimated for T5 treatment and the lowest (2.81) for T6.
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: JANUARY-JUNE, 2011