author(s)
Harshita AP, Saikia DK, Anjumoni Devee, Bora LC and Phukan SL

abstract
Seasonal incidence of aphid, Aphis gossypii and its natural enemies were studies at college of agriculture, Assam Agricultural University, Jorhat, Assam during 2015-16 and 2016-17. Aphid reached its peak (9.4 and 9.1/leaf) during March and first fort night of February during 2015-16 and 2016 -17, respectively. During the present investigation, altogether, three species of coccinellid predators were encountered in the tomato ecosystem and these includes Coccinella transversalis, Micraspis discolour, Coccinella septempunctata. They showed a significant negative correlation with average relative humidity and a non-significant positive correlation with maximum temperature and also showed a positive significant correlation with aphid population during 2015-16 and 2016-17, respectively. The findings from the current study showed that the coccinellid beetles could able to control the aphid population effectively after correlation and regression analysis.