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The bio-efficacy of four plant leaf extracts viz., apple of sodom, Calotropis procera Aiton; Mexican poppy, Argemone mexicana Linnaeus; Mexican marigold, Tagetes minuta Linnaeus and Indian neem, Azadirachta indica were tested against mustard aphid, Lipa- phis erysimi on 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 cent L. 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.

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