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3911又叫甲拌磷,是一种内吸有机磷杀虫剂。它具有胃毒、触杀和熏蒸杀虫作用,对防治蚜虫和红蜘蛛等效果最好,还可以兼治介壳虫、卷叶虫和地下害虫。浸、拌棉籽的残效可达1个月以上。3911对人、畜毒性极强,致死中量为1.75～2.5毫克/公斤,是有机磷杀虫剂中毒性最强的一种。目前我国生产的3911制剂有75%乳剂和40%粉剂两种。因其毒性太强,仅限于做棉花种子处理,其他作物不宜使用.
3911, also known as phorate, is an organophosphate insecticide. It has stomach poisoning, contact and fumigation insecticidal effect, the best for the prevention and control of aphids and spider mites, but also can kill scale insects, leaf roller worms and underground pests. Baptist, mixed cottonseed residual effect of up to 1 month or more. 3911 pairs of people, livestock extremely toxic, lethal in the amount of 1.75 to 2.5 mg / kg, is the most toxic organophosphate insecticide one. At present, China’s production of 3911 formulations 75% emulsion and 40% powder two. Because of its toxicity, only to do cotton seed treatment, other crops should not be used.