Effect of Intercropping with Mustard with Onion and Garlic on Aphid Population and Yield

Field experiments were conducted to study the effect of intercropping of mustard (Brassica napus, Var. Bari Sarisha-7) with onion (Allium cepa L.) and garlic (Allium sativum L.) on aphid [Lipaphis erysimi (Kaltenbach)] population and yield. Intercropped with these two medicinal as well as spice crops reduced the aphid population significantly (P<0.05). Mustard blocks intercropped with garlic gave highest cost-benefit ratios (1:2.07 and 1: 2.96) than onion intercropped blocks. Sole mustard blocks produced lowest cost-benefit ratios (1:1.65 and 1:2.06).