Indonesia, Melanesia

L. pallidum

lapan, Korea, Primorye region of Russia

L. pavlovskyi

Primorye region of Russia

L. scutellare

Japan, China, Thailand, Malaysia

hides, cheeses, dried milk, and other dairy products. Such mite infestations are the cause of occupational acariñe dermatitis in farmhands, granary operators, warehouse workers, and other personnel.

The stored-products mites responsible for most human cases of acariñe dermatitis are members of the families Acaridae, Pyemotidae, and Cheyletidae.

Acaridae and Other Astigmata

Acarid mites infest a wide range of stored materials such as grains, milk products, dried fruits, straw, and animal hides in both households and commercial storage facilities. They also are common contaminants of culture media in which insects and other invertebrates are reared; in bedding materials for mice, guinea pigs, hamsters, and other vertebrates; and in animal feed and animal-holding cages in pet stores and zoos. Their numbers can build rapidly, especially when the infested materials are damp enough to support the growth of fungi on which they typically feed. Dermatitis occurs when the mites pierce the skin in attempts to feed or obtain moisture. The reaction in some cases also may involve contact allergens.

The most important acarid mite in stored products is Acarussiro (Fig. 23.12), a species found throughout most of the world. It is particularly a pest of processed cereal products (e.g., flour), rather than whole grains or hay. The females are 350—650 ¡xm in length, with a colorless body and yellow-to-brown gnathosoma and appendages. It can develop at temperatures of 24—32°C and a relative humidity greater than 60%. This mite tends to congregate where the relative humidity is 80—85%, at which its reproductive rate is highest. The amount of damage it causes to grains is directly related to the moisture content; the germ is attacked only when the water content is 14% or

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