[Preliminary investigation of breeding status in ground dust flour in Qiqihaer City].

Objective: To investigate the breeding status in the ground dust flour collected in Qiqihaer City.

Methods: Totally, 16 aliquots of ground dust flour were respectively collected from a college canteen and 15 households in Qiqihaer City. Then 10 g dust flour was taken from individual sample for isolation of the mites that were made of slide specimen, and the mites were identified and classified under a microscope.

Results: Acaroid mites were found in 15 of the 16 aliquots of samples (detection rate being 93.8％), and 7 species, belonging to 6 genera under 3 families, were identified. A total of 561 heads of mites were isolated from 160 g samples, with an average breeding density of 3.51 heads/g. The most breeding mite was associated with .

Conclusions: Various species of mites are breeding in the ground dust flour in Qiqihaer City, and occurs the most. These findings indicate that effective measures should be taken to prevent and control the harm associated with acaroid mite contamination.