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T－751（0-甲基-o-苯基-s-正丙基硫代磷酸酯）对粘虫具有高速击倒活性，在所试验的5种杀虫剂中，T－751对粘虫击倒最快。在14·11mg／m2的剂量下，KT50值为5.32分钟，比杀螟松、喹噁磷分别高8倍和1倍。T－751对棉铃虫的击倒活性也是所试验的杀虫剂中最快的。T－751对粘虫具有胃毒和触杀活性，不具有内吸作用。
T-751 (0-methyl-o-phenyl-s-n-propyl phosphorothioate) had a high-speed knockdown activity against armyworms. Among the five pesticides tested, Knocked down the fastest. The KT50 value was 5.32 minutes at the dose of 14.11 mg / m2, 8 times and 1 times higher than fenitrothion and quinophos. The knockdown activity of T-751 against H. armigera was also the fastest among the tested pesticides. T-751 on armyworm stomach poisoning and contact activity, does not have systemic action.