Abstract:
An experiment was conducted to evaluate the effectiveness of sonic control options
against the insect pests of wheat and their natural enemies during the period from
November. 2012 to Marc!). 2013 at the central thrm of Sher-e-Bangla Agricultural
L:niversity, Dhaka. Bangladesh. The experiment consists of six management practices
such as: 1,: Cultural control (weeding) at 10 days interval, i2: Mechanical control
(handpieking of infested tiller) at 7 days interval: 13: Cultural control + Mechanical
control at 7 days interval: 14: Spraying of Suntap 50 SP @3.0 gm/f. of water at 7 days
interval -t Mechanical control; 1 5: Spraying of Marshal @3.0 nil/I. of water at 7 days
interval - Cultural control + Mechanical control at 7 days interval; T6:Spraying olNeern
oil 3.0 nil! 10 1. of vater at 7 days interval + Cultural control -I- Mechanical control at 7
days interval and 17: Untreated control. The experiment was laid out in Randomii.ed
Complete Block Design (RCI3D) with three replications. Incidence of major insect pest
of wheat was recorded as aphid. wireworm. stem fly and army worm. Incidence of
natural enemies were also recorded as lady bird beetle, parasitic wasps (parasitoid).
svrphid liv and spider. At tillering stage, the lowest infested plants were observed from
T (1.37%) treatment, on the other hand, the highest infested plant was recorded in 17
(1 3.23%) untreated control treatment At panicle initiation stage, the lowest infested
plants were observed from Ti(1 .75%) treatment. but the highest infested plants were
recorded in 17 (1 5.6O%) untreated control treatment. Finally, during grain filling stage.
the lowest infested plants were observed from i 5 (2.49%) treatment, whereas the highest
infested plants were recorded in 17 (18.77%) untreated control treatment. The longest
plant was measured from T5 (92.80 cm) treatment. while the shortest plant was obtained
from 17( 77.56 cm) untreated control treatment. 'Ihe highest yield was recorded from T
(3.43 t/ha) treatment, while the lowest yield was obtained from T7 (2.14 t/ha) untreated
control treatments. Spraying of Marshal @ 3.0 nil/I, of water at 7 days interval -
Cultural control + Mechanical control at 7 days interval showed superior br controlling
wheat insect pests.
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, 2013