The physical action of three diatomaceous earths against the cuticle of the flour miteAcarus siro L. (Acari: Acaridae)
作者:Dean A Cook、Maureen E Wakefield、Gareth P Bryning
DOI:10.1002/ps.1484
日期:2008.2
Experiments examined the accepted modes of action of the desiccant dust, diatomaceous earth (DE), against the flour mite, Acarus siro (L.) (Astigmata). Adult mites were exposed to three DE products for periods of 3, 18 and 72 h under conditions designed to allow partial desiccation of the mites without causing mortality. After exposure, the DE dust particles were washed off the mite bodies, and both
实验检查了干燥粉尘硅藻土(DE)对白螨Acarus siro(L.)(Astigmata)的可接受的作用方式。将成年螨在设计为允许螨部分干燥而不会造成死亡的条件下,暴露于三种DE产品中3、18和72小时。暴露后,将DE尘埃颗粒从螨虫身上洗去,并通过气相色谱-质谱(GC-MS)分析检查DE和螨虫中是否存在表皮碳氢化合物。GC-MS鉴定了链长为C(13)-C(26)的七个主要表皮脂质,它们可能在西罗非鱼的防水作用中起作用。暴露18小时后,在其中一种DE产品上检测到正十三烷和几种不同的长链脂肪酸乙酯。72小时后,在所有三种DE产物中均检测到正十三烷。去除DEs后保留的螨样品通过显微镜检查。常规低倍镜观察到的初步证据可能表明表皮的均匀去除。但是,通过扫描电子显微镜的详细检查没有发现磨损的迹象。