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Storage mites are important sources of airborne allergens, especially on farms. A mite survey was conducted in the working environments of 121 farms in five regions of Germany. Of 859 samples, 743 (86.4%) contained mites, representing 547 857 astigmatic mites in 723 g of dust and 34 501 prostigmatic mites in 469 g of dust. Dust samples from nine sites of each farm were collected arid analyzed. Ninety-three percent of all mites belonged to the order Astigmata (storage- and house-dust-mite species): 35 Astigmata and 14 Prostigmata mite species were identified. According to the abundance and steadiness of the important astigmatic mite species. the following order was found: Lepidoglyphus destructor > Glycyphagus domesticus > Aearus siro > Tyrophagus longior > Blomia tjibodas > Chortoglyphus arcuatus > Thyreophagus entomophagus > Tyrophagus putrescentiae > Europlyphus longior > Tyrophagus palmarum > Acarus farris > Acarus immobilis > Gohieria Fusca, Blomia tjibodas was described for the first time as an abundant species of farms in Germany. [ABSTRACT FROM AUTHOR]