BIOLOGY AND DAMAGE ASSESSMENT OF DIFFERENT STORED GRAINS INFESTED BY ANGOUMOIS GRAIN MOTH SITOTROGA CEREALELLA (OLIVIER) IN THE LABORATORY

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.