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测定了T-751（O-甲基-O-苯基-S-正丙基硫代磷酸酯）对4种害虫的杀虫活性。结果表明，T-751对东方家蝇、豆蚜和二斑叶螨的LD50分别为0．42、70．5、4．20mg／L。T-751对东方家蝇的杀虫活性要比杀螟硫磷高11倍。在剂量分别为2．95，7．37mg／m2时，该药对东方家蝇和美洲大蠊的KT50分别为13．57和30．83分钟。
The insecticidal activity of T-751 (O-methyl-O-phenyl-S-n-propyl phosphorothioate) against four pests was determined. The results showed that the LD50 of T-751 to Oriental housefly, Aphis gossypii and Tetranychus urticae were 0.42,70.5 and 4.20mg / L, respectively. T-751 insecticidal activity of Oriental housefly than fenitrothion 11 times higher. At doses of 2.95 and 7.37 mg / m2, the KT50 of the drug was about 13.57 and 30.83 minutes for Oriental housefly and American cockroach.