储藏物害虫嗜卷书虱对DDVP熏蒸的行为反应与致死剂量

1 引言 嗜卷书虱(Liposcelis bostrychophila)属啮虫目虱啮科。其体形微小,食性复杂,栖息场地多在粮食仓库及食品加工厂、图书馆、标本馆等地。大量发生时可造成严重损失,传播微生物,并以其尸体、排泄物等污染储藏的粮食和其它储藏物品。王进军等调查发现,在我国“双低”和“三低”贮粮的粮仓中,书虱已成为优势种群,对贮粮安全构成了威胁。使用病原真菌和细菌来防治嗜卷书虱,很难达到理想效果,即使采用菊酯类杀虫剂也难以奏效,贮粮熏蒸中普遍使用的溴甲烷(CH_3Br)和磷化氢(PH_3)对嗜卷书虱的防治效果也不很理想。利用昆虫生长调节剂防治嗜卷书虱的研究已有一些报道,但在具体应用上还存在着一些问题。气调措施可应用于控制书虱种群的增长,但书虱的抗气性发展很快,

Acute lethal and behavioral response of Liposcelis bostrychophila (Psocoptera:Liposcelididae) to DDVP

Book louse Liposcelis bostrychophila is a minor pest in stored products, and may seriously infest the stored products when its population outbreaks. This study was conducted to evaluate the toxic effect of DDVP on various development stages of L. bostrychophila. The results showed that at 28 +/- 0.5 degrees C and 24 h exposure under 75%-80% RH, the LC50 of the eggs, larvae of 1st to 4th stadium, and adults was 16.83, 0.22, 0.22, 0.23, 0.26 and 0.25 micrograms.L-1, respectively. The lethal effect of DDVP on the adults at different exposure periods showed that their mortality was linearly related to the treated time, implying that the test colony of L. bostrychophila was susceptible to DDVP. In the practical fumigation, DDVP as a fumigant had a good effect on the pest control if the development stage, time and periods of treatment were appropriate.