Bio-Efficacy of some Plant Leaf Extracts against Mustard Aphid, Lipaphis erysimi Kalt. on Brassica campertris

The effect of seven different botanical leaves, neem leaf extract (Azadirachta indica), Congress grass leaf extract (Parthenium hysterophorus) Lemmon grass leaf extract (Cymbopogon citrates), Bhang leaf extract (Cymbopogon citrates), Garlic leaf extract (Allium sativum), Punch phuli leaf extract (Lantana camera) and Marigold Leaf extract (Tagetes erecta) on mustard aphid was assessed in field at Student's Instructional Farm of Narendra Deva University of Agriculture and Technology, Narendra Nagar (Kumarganj), Faizabad (U.P.). The dead aphids were counted on tagged plants on 10 cm terminal shoot from 10 randomly selected plant par plot. The botanical extracts showed varying effect on aphid population and neem leaf extract (T₁) inflicted consistently the maximum level of aphid mortality (77.33% and 71.76%) followed by Punch phuli leaf extract (74.35% and 70.96%) and Garlic leaf extract (73.19% and 62.17%) during seventh day after spray in both year 2009-2010 and 2010-2011. All the treatments of plant leaf extracts showed insecticidal activity, but Indian neem leaf extract followed by Punch phuli leaf extract and Garlic leaf extract reduced the aphid population to a great extent.