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Cotton and wheat are the major cash crops of Pakistan and mainly cotton-wheat crop rotation is followed in the Punjab province of Pakistan. Aphid (Aphis gossypii) attacks on both of these crops including wheat (Triticum aestivum) and cotton (Gossypium hirsutum). Lady bird beetle Coccinella septempunctata is the local key predator of aphid. Food preference of predator C. septempunctata towards different kinds of aphid and semio-chemical effect of different crops including cotton (Gossypium hirsutum) , wheat (Triticum aestivum), brassica (Brassica oleracea), dumbi siti (Phalaris minor) and oat...