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Species Page

flour mite

Acarus siro
This information is part of a full datasheet available in the Crop Protection Compendium (CPC). Find out more information on how to access the CPC.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.


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Host plants / species affected

Main hosts

show all species affected
Poaceae (grasses)
stored products (dried stored products)
wheat flour

List of symptoms / signs

Fruit - external feeding
Seeds - external feeding

Prevention and control

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:


A. siro is undoubtably one of the most serious pests of stored foodstuffs, although care must be taken when citing references prior to 1970 in that records for A. siro will involve incidences of the occurrence of the two closely related species in the A. siro complex (Griffiths, 1970).

The major damage to whole cereal grains and other seeds, for example oilseed rape, linseed, pulses and various spices, is caused by the preferential attacks that mites make on the germ, which causes losses in germination viability. Odours build up in heavy infestations, caused by mites' lipid secretions. This musty or minty smell, together with the large numbers of live and dead mite bodies, is a major factor in rejecting foodstuffs from sale. These effects on the quality and hygienic condition of stored foodstuffs are discussed by Solomon (1946, 1962), Pulpan and Verner (1965), Smith (1967), Griffiths et al. (1976), and Sinha (1984).