Bio-Efficacy Of Some Plant Leaf Extracts Against Mustard Aphid, Lipaphis Erysimi Kalt. On Indian Mustard, Brassica Juncea

Abstract

Bio-Efficacy Of Some Plant Leaf Extracts Against Mustard Aphid,Lipaphis ErysimiKalt. On Indian Mustard,Brassica JunceaThe bio-efficacy of four plant leaf extractsviz., apple of sodom,Calotropis proceraAiton; Mexican poppy,Argemone mexicanaLinnaeus; Mexican marigold,Tagetes minutaLinnaeus and Indian neem,Azadirachta indicawere tested against mustard aphid,Lipaphis erysimion Indian mustard,Brassica juncea. The highest per cent aphid reduction during first, second and third spray were 28.79, 40.52 and 59.32 at 1 : 10 g/ml; 34.70, 44.49 and 66.14 at 1 : 5 g/ml and 53.88, 64.84 and 100.00 at 1 : 2.5 g/ml with Indian neem. However, Mexican marigold was also effective at highest concentration (1 : 2.5 g/ml) and reduced 96.38 per centL. erysimi. All the treatments of plant leaf extracts showed insecticidal activity, but Indian neem followed by Mexican marigold reduced the aphid population to a great extent.