Abstract:

The mites of Demodex folliculorum were collected by the squeezing method and cellophane tape method. Screened using a digital microscopy with the Motic DM B5 software, the mites were then randomly divided into different groups and put under various temperatures to determine the survival time and moving activity. Dynamic pictures of the D. folliculorum development process were given. It was found that D.folliculorum at pre-nymph stages has four pairs of legs and the nymph has moving ability. D. folliculorum could survive better in low temperature than in high temperature. The survival temperature range of D.folliculorum was 8-30℃; the suitable development temperature range was 20-30℃, of which the most suitable temperature range was 25-26℃. Extreme temperatures below 0℃ or above 37℃ were harmful to the survival of mites. The lethal temperature for D.folliculorum was 54℃, and the effective temperature in killing D.folliculorum was 58℃. The results may be used to guide the in vitro cultivation, prevention and control of  D.folliculorum.
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Key words: Demodex folliculorum, morphology, survival temperature, survival time, moving activity