VARIETAL SCREENING OF RICE FOR RESISTANCE AGAINST ANGOUMOIS GRAIN MOTH, SITOTROGA CEREALELLA (OLIVIER)

Abstract

The study was conducted in the laboratory of the Department of Entomology, Sher-e- Bangla Agricultural University, Dhaka, Bangladesh during the period from July, 2014 to February, 2015 to find out the varietal response of rice on growth and development of Angoumois grain moth, Sitotroga cerealella (Oliv.) and to find out the resistant/tolerant varieties in storage. The experiments were laid out in Completely Randomized Design (CRD) with four replications. The rice varieties tested were BR 11, BR 22, BR 26, BRRI dhan 28, BRRI dhan 29, BRRI dhan 49, BRRI dhan 50, BINA 7, ACI-1 (hybrid) and Chamak-1 (hybrid). It was found that none of the varieties were completely immune to S. cerealella. But Significant differences were observed among ten rice varieties on larval incidence, adult emergence, grain damage percentage, seed germination percentage and grain content loss by S. cerealella. The highest larval incidence was found in BRRI dhan 50 (83.33 %) and the lowest was in BR 11 (30.00 %). Highest number of adult emergence occurred in BRRI dhan 50 (77.67) and lowest number of adult emergence was found in BR (27.67). The highest grain content loss was observed in BRRI dhan 50 (6.89 %) and the lowest was in BR 11 (0.61 %). Moreover highest number of seed germination was found in BR 11 (73.33) and the lowest number was in BRRI dhan 50 (18.67 %). In no choice, test highest grain damage was found in BRRI dhan 50 (10.00 %) and lowest grain damage was in BR 11 (1.11 %). The highest grain content loss was in BRRI dhan 50 (10.02 %) and the lowest grain content loss was in BR 11 (1.16 %). In free choice, test highest grain damage occurred in BRRI dhan 50 (9.00 %) and the lowest damage occurred in BR 11 (1.00 %). The highest grain content loss was observed in BRRI dhan 50 (9.02 %) and the lowest grain content loss was in BR 11 (1.02 %). Among the rice varieties BRRI dhan 50 was found the most susceptible host for S. cerealella in respect of both growth and development and food consumption. On the other hand, BR 11 was the resistant variety for S. cerealella.