Y. BILASHINI AND T.K. SINGH

Studies on population dynamics of Coccinella septempunctata Linnaeus and Lipaphis erysimi (Kaltenbach) on cabbage Brassica juncea var. capitata were conducted under field conditions during 2003-05. The numerical density of the predator was observed to increase in response to increase in density of aphid prey in the field. The peak population of the prey and predator concided was found in the month of February. The correlation analysis showed highly significant positive correlationship between predator and aphid species. While temperature, relative humidity and rainfall exhibited negative correlation with predator and prey population however, sunshine and wind speed had positive correlation. Among the larval stages of C. septempunctata, the fourth instar larvae consumed more number of L. erysimi and in the adult stages female consumed more then male beetles