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２５％对氯杀虫酯乳油（以下简称Ｐａｃｙ）系采用对硫磷与氯氰菊酯经科学复配而成的混剂，经室内毒力测定，该混剂对棉蚜具有明显的增效作用，其共毒系数为４０４．８。田间试验结果进一步表明，该混剂最佳配方为：对硫磷：氯氰菊酯＝２４７∶３，使用该配方制成的２５％混剂防治稻棉主要害虫，每６６７ｍ２用量１００～１５０ｇ，防效达９０％以上，持效期１０～１５ｄ。１９９６年示范推广４．７万ｋｍ２，经济效益显著
25% Chloro insecticide EC (hereinafter referred to as Pacy) is a mixture of parathion and cypermethrin scientifically formulated. It has obvious synergistic effect on cotton aphid by indoor toxicity test. The co-toxicity coefficient was 404.8. The results of field experiments further showed that the best formula of the mixture was parathion-cypermethrin = 247: 3, and the main pests of rice paddy were controlled by using 25% of the mixture with the dosage of 100-150g per 667m2. More than 90%, persistence 10 ~ 15d. Demonstration in 1996 to promote 47,000 km2, significant economic benefits