Abstract:
Consequently two experiment was conducted in the laboratory of the Department
of Entomology, Sher-e-Bangla Agricultural University, Dhaka-1207 during the
period from May to December, 2014 to study to study biology and damage
assessment of different stored grains infested by Angoumois grain moth Sitotroga
cerealella (Olivier) in the laboratory. Rice, wheat and maize seeds were used as
experimental materials. The rice moth, S. cerealella (livier) adults started mating
after 24 hrs of emergence. On rice grains the female moth lays 80-140 eggs with
an average of 109 eggs, whereas on wheat grains the female moth lays 71-97 eggs
with an average of 82.7 eggs and in maize the female moth lays 49-73 eggs with
an average of 55 eggs throughout its life. Morphometric measurement revealed
that in consideration of larva, length was 16.0 ± 0.19, 17.5 ± 0.18 and 18.2 ± 0.07
mm, respectively for rice, wheat and maize grains and width was 2.90 ± 0.04, 3.10
± 0.09 and 3.27 ± 0.12 mm, respectively for rice, wheat and maize grains. At 1st
generation in weight basis, the highest (14.29%) infestation was recorded in rice
stored grains, whereas the lowest (8.70%) infestation was recorded in maize
grains seeds. At 2nd generation in weight basis, the highest (21.79%) infestation
was recorded in rice stored grains which was closely followed (17.07%) by wheat
grains, whereas the lowest (13.64%) infestation was recorded in maize grains
seeds. At 3rd generation in weight basis, the highest (22 g) weight of infested
seeds was recorded in rice grains, while the lowest (16 g) was found in maize
grains. Consideration of infestation, the highest (33.85%) infestation was recorded
in rice stored grains, whereas the lowest (19.51%) infestation in maize grains
seeds. At 1st generation in case of weight loss, the highest (16.50%) weight loss
was observed in rice seeds, whereas the lowest (10.15%) weight loss was recorded
in maize seeds as a grain store. At 2nd generation in case of weight loss, the
highest (30.25%) weight loss was observed in rice seeds, whereas the lowest
(21.63%) weight loss was recorded in maize seeds. At 3rd generation in case of
weight loss, the highest (43.50%) weight loss was observed in rice seeds, whereas
the lowest (15.20%) weight loss was recorded in maize seeds as stored grains.
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, 2014