Evaluation of some bioagents against mustard aphid (Lipaphis erysimi (Kaltenbach)) (Hemiptera: Aphididae) on single plant in field condition

摘要

Four bioagents, viz., Coccinella septempunctata L., Menochilus sexmaculatus (F.), Chrysoperla cornea (Stephens) and Verticillium lecanii (Zimmerman), were evaluated against mustard aphid, Lipaphis erysimi (Kaltenbach), on single plants covered with muslin cloth in the field at National Research Centre on Rapeseed-Mustard, Sewar, Bharatpur (Rajasthan) during 2005-06 and 2006-07. C. septempunctata @ two adults/plant was found to be the most effective, reducing 96.19% of the aphid population in 10 daysfollowed by C. septempunctata @ two larvae per plant (93.42%), V. lecanii @ 108 spores~(-ml) (84.90%), M. sexmaculatus @ two adults (84.62%) and C. cornea @ four larvae plant (82.98%). C. septempunctata @ one adult per plant reduced the aphid populationby 77.49% and M. sexmaculatus by 69.08%.