D.K. MEENA, R. SWAMINATHAN, K.K. BHATI AND H.K. JAIN

Population dynamics of the coriander aphid and its coccinellid predators were studied in the Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur-313001, during rabi 2008-09. The incidence of coriander aphid, Hyadaphis coriandari (Das.) began in the second week of January 2009 that gradually increased in numbers reaching to the maximum (584.16 per 3-plant total) in the first week of February 2009. The aphid population was negatively correlated with mean atmospheric temperature and relative humidity. The predatory activity of the coccinellids, C. septempunctata and M. sexmaculata also began in the second week of January, and during January to February their population ranged from 0.5 to 15 beetles per 3-plant. The adult coccinellids had a significant positive correlation with atmosphere temperature; whereas, with relative humidity the correlation was significantly negative. The adult coccinellids as well as grubs had a significant negative correlation with the aphid population.