磷化氢熏蒸处理对嗜卷书虱不同虫态的致死作用

实验室条件下系统研究了磷化氢(PH3)对储物害虫嗜卷书虱Liposcelis bostrychophila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120 h熏蒸处理的LC50分别为0.137、0.045和0.035 mg/L;而24 h熏蒸处理对若虫的LC50在4.285~7.364 μg/L之间,对成虫的LC50为20.404 μg/L;采用25 μg/L的PH3进行24 h熏蒸处理,间隔10 d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 (12 μg/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 Effect of Phosphine on Different Stages of Liposcelis bostrychophila Badonnel

Lethal effects of phosphine (PH3) 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 PH3 intermittent fumigation and alternative treatment of controlled atmosphere (CA) and PH3. And then compare the control efficiency of different treatments on L. bostrychophila population. Results showed that PH3 fumigation had different lethal effects on different stages of L. bostrychophila. After 24, 72 and 120 h exposure, LC50 of egg were 0.137, 0.045, and 0.035 mg/L,respectively; after 24 h treatment, LC50 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 PH3 for 24 h every 10 d, the population was completely controlled. And after alternative treatment with PH3 (12 μg/L) and CA (35% CO2, 1%O2, 64%N2), the resistance of population was delayed, and the occurrence of L. bostrychophila was completely controlled after the alternative treatment for 3~5 times.