Abstract
An apparatus for assessing repellency of chemical compounds against trombiculid mites is described. Five chemicals, dibutylphthalate, dimethylphthalate, N,N-diethyl-m-toluamide (deet), a proprietary preparation (deet + dimethyl-phthalate), and pyrethrum impregnated on filter paper and nylon/cotton fabric were tested with Leptotrombidium (L.) deliense and L. (L.) akamushi. Screening tests have shown that deet + dimethylphthalate is more effective than others. Simple methods are described to assess mortality of mites from contact and from repellent vapor.

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