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洗衣粉含有表面活性剂烷基苯磺酸钠,当接触蚜虫体表时,便形成一层不透气、不透水的薄膜堵塞气孔,使蚜虫窒息而死。而尿素具有破坏昆虫几丁质的作用,因此,洗衣粉和尿素配合使用,可明显提高杀虫效果。据试验,用尿素和洗衣粉配制而成的“尿洗合剂”,对麦蚜、菜蚜等各类蚜虫(俗称脒心虫),都有较为明显的防治效果,杀蚜率可达95％以上,同时还能起到根外追肥作用,促进农作物生长。实践证明,洗衣粉、尿素、水的最佳配比为1∶4∶500。
Washing powder contains sodium alkylbenzene sulfonate surfactant, when in contact with aphid body surface, they formed a layer of impermeable, impermeable film to plug the pores, aphids suffocate and die. The urea has the effect of damaging insect chitin, therefore, washing powder and urea used in conjunction, can significantly improve insecticidal effect. According to the test, the “urine washing and dissolving agent” formulated with urea and washing powder has obvious control effects on various kinds of aphids such as wheat aphid and cabbage aphid, killing the aphid rate up to 95% Above, but also can play the role of root top dressing, to promote crop growth. Practice has proved that washing powder, urea, water, the best ratio of 1: 4: 500.