关键词: 拟除虫菊酯, 效果观察, 灭臭虫, 药笔, 死亡率, 模拟试验, 粉笔, 农药研究所, 死亡数, 拟除虫菊酯杀虫剂

Abstract: Insecticide-chalks impregnated with either one of the three kinds of synthetic pyre-throids (deltamethrin, permethrin and cypermethrin) have been used to kill bedbugs (Cimex lectularius) in our laboratory.The results showed that three kinds of insecticidechalks are all effective, cypermethrin being the best one. After contacting with the paper spread with insecticide-chalk for one minute, bedbugs were all killed in 24 hours (Table 1). In simulation experiments,after having crossed over a 0.6cm-barrier on paper traced with 18mg/g cypermethrin-chalk, 97.5% of bedbugs were killed in 24 hours, 100% in six days, whereas 100% of bedbugs were killed in 24 hours over a 1.2-1.8ern-barrier on traced paper (Table 2). The effectiveness of cypermethrin-chalk can last for more than 140 days, suggesting that it is highly effective against bedbugs. Besides, cypermethrin-chalk has no unpleasant ordour and is convenient for use.