ROLE OF PARASITOIDS AND HOST PLANT TOLERANCE IN CONTROLLING THE CABBAGE APHID, BREVICORYNE BRASSICAE (L.) (HOMOPTERA : APHIDIDAE) ON CANOLA AT EL-MINIA GOVERNORATE- EGYPT

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt

Abstract

This study was carried out at El-Minia Governorate for the two successive seasons, 2005 and 2006 to evaluate the efficacy of the integration of parasitoids and host plant tolerance against the cabbage aphid, Brevicoryne btassicae (L.) in canola (rapeseed) fields. It was recorded two aphid peaks, the first was weak during the budding stage, and the second was severing during flowering growth stage (5195-4125 individuals/20 plants) in both seasons, respectively. Rate of parasitism by the sole identified parasitoid, Diaeretiella rapae McIntosh on the cabbage aphid was recorded through January to April in both years with average of 72.3 and 85.9% in 2005 and 2006 seasons, respectively. The highest parasitism percentage (100%) was recorded in mid April during ripening stage in both seasons. Varieties M2&12 were the best and could be recommended to be used in an integrated control program against aphid on canola plants. These varieties harbored the lowest numbers of aphids (143.3-193.8 and 100.0-144.5 aphids/20 plants, respectively), had the highest rate of parasitism and produced the heaviest seed yield (933.8-1127.4 and 956.1 -1285.0 Kg. seed/fed., respectively). On the other side, varieties M260 84339 were the worst.

Keywords

Files

Share

How to cite

Statistics