磷化氢熏蒸处理对嗜卷书虱不同虫态的致死作用

Lethal Effect of Phosphine on Different Stages of Liposcelis bostrychophila Badonnel (Psocoptera: Liposcelididae)

实验室条件下系统研究了磷化氢(PH3)对储物害虫嗜卷书虱Liposcelisbostrychophila卵、各龄若虫和成虫的致死作用,并选用PH3间歇熏蒸以及PH3与气调交替处理等措施对嗜卷书虱进行处理,比较了不同处理措施对嗜卷书虱种群的控制效果。结果表明,PH3熏蒸处理对嗜卷书虱各虫态有不同的致死效果。对卵而言,24、72和120h熏蒸处理的LC50分别为0.137、0.045和0.035mg/L;而24h熏蒸处理对若虫的LC50在4.285～7.364μg/L之间,对成虫的LC50为20.404μg/L;采用25μg/L的PH3进行24h熏蒸处理,间隔10d后再分别进行第2次和第3次熏蒸处理,可以完全控制嗜卷书虱的发生。采用PH3(12μg/L)和气调(体积比例为35%CO2,1%O2,64%N2)交替处理能够延缓嗜卷书虱种群抗性的发展,交替处理3～5次可以完全控制嗜卷书虱的发生。

Lethal effects of phosphine (PH3) on egg, nymph and adult of L.bostrychophila were conducted in laboratory and lethal concentration was systematically determined in this research. In addition, L. bostrychophila was treated with PH3 intermittent fumigation and alternative treatment of controlled atmosphere (CA) and PH3. And then compare the control efficiency of different treatments on L. bostrychophila population. Results showed that PH3 fumigation had different lethal effects on different stages of L. bostrychophila. After 24, 72 and 120 h exposure, LC50 of egg were 0.137, 0.045, and 0.035 mg/L,respectively; after 24 h treatment, LC50 of nymph varied in the rage of 4.28～7.36 μg/L, and that of adults was 20.404 μg/L. Exposed to 25 μg/L PH3 for 24 h every 10 d, the population was completely controlled. And after alternative treatment with PH3 (12 μg/L) and CA (35% CO2, 1%O2, 64%N2), the resistance of population was delayed, and the occurrence of L. bostrychophila was completely controlled after the alternative treatment for 3～5 times.