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Effect of plant extracts and some biorational insecticides on egg hatch, survival and predation rates of Menochilus sexmaculata (Fabrieius) and Coccinella trasversalis Fabricius:the key natural enemies of cruciferous vegetable aphids in south Chin

植物提取物和常用药剂对蚜虫重要天敌瓢虫孵化、存活和捕食效能的影响