Seasonal Abundance of Fennel Aphid, Hyadaphis coriandri Dass and Associated Bioagents in Fennel Crop

The fennel aphid remained active during February to April, with peak activity on first week of March. Maximum, minimum temperature and bright sun shine hours had positive effect on the population of aphid while relative humidity had negative effect on population of aphid. The population of coccinellid predators (Coccinella septempunctata and Menochilus sexmaculatus) had positive effect on the population of aphids. In nature, grub of C. septempunctata was severely parasitized by hyperparasite, Tetrastichus coccinellae. Maximum per cent parasitism of grubs was observed on 20^th, 23^rd, and 26^th March due to T. coccinellae, resulted in failure of grubs to pupate.