Evaluation of some bioagents against mustard aphid (Lipaphis erysimi Kaltenbach) (Homoptera: Aphididae) under field conditions

Bioagents viz., Coccinella septempunctata (Linnaeus), Chrysoperla carnea (Stephens) and Verticillium lecanii (Zimmerman) were evaluated against mustard aphid (Lipaphis erysimi Kaltenbach) on Brassica rapa var. brown sarson (Variety BSH-1) under field conditions at National Research Centre on Rapeseed-Mustard, Sewar, Bharatpur during 2005–06 and 2006–07. C. septempunctata @ 5, 000 beetles/ha was found most effective reducing 86.60% aphid population after 10 days of release followed by V. lecanii @ 10⁸ CS/ml (74.23%) and C. septempunctata @ 3, 000 beetles/ha (68.37%). Maximum yield was recorded in C. septempunctata @ 5, 000 beetles/ha followed by V. lecanii @ 10⁸ CS/ml and C. septempunctata @ 3, 000 beetles/ha.