对粘虫棉铃虫具有速杀活性的新有机磷杀虫剂T-751

High knockdown activity of new organophosphorus insecticide T-751 to armyworm and the cotton bollworm

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, O-methyl -O-phenyl -S- n- propyl phosphorothioate has high knockdown activityto the armyworm, Mythimna separata (Walker). The knockdown activity of T-751 to the armywormis the fastest in the 5 tested insecticidcs. KT50 value of T-751 is 5.32 minutes at dose of 14. 11mg/m2. It is about 8-fold and l-fold faster than Sumithion;and Quinalphos respectively. The knockdowaactivity of T-751 to the cotton bollworm, Hcliolhit armigera Hiibner, is the fastest in the tested iu-secticides. T-751 possesses stomach poison and contact poison to the armyworm. but dccs not havesystemic activity.