Insects and mites in stored grain and grain stores

This poster shows the more common of over 50 insect and mites species that may occur in grain stores. Correct identification is important.

A sign of suboptimal storage conditions, the presence of live insects and mites is unacceptable to processors and can result in damage to grain. To check for insects, sieve representative samples (typically using a 2mm mesh) and inspect the material thoroughly.
Grain storage home How to spot grain defects impurities Pest management home

Available in print

Order a printed copy

Primary pest: Grain-damaging species

Saw-toothed grain beetle

Oryzaephilus surinamensis

Rust-red grain beetle

Cryptolestes ferrugineus

Grain weevil

Sitophilus granarius

Foreign grain beetle

Ahasverus advena

Saw-toothed grain beetle
Rust-red grain beetle


Flour mite

Acarus siro

Cosmopolitan food mite

Lepidoglyphus destructor

Lesser grain borer

Rhyzopertha dominica


Cosmopolitan food mite

Secondary pest: Mould or hygiene-related species

Brown house moth

Hofmannophila pseudospretella

White-shouldered house moth

Endrosis sarcitrella

Hairy fungus beetle

Typhaea stercorea

White-marked spider beetle

Ptinus fur

Brown house moth
White-shouldered house moth
Hairy fungus beetle
White-marked spider beetle

Mould beetle

Cryptophagus species

Mould beetle

Plaster beetle

Lathridiidae

Plaster beetle

Booklice

Psocoptera species

Booklice

Non-damaging or stray species

Rove beetle

Staphylinidae

Ground beetle

Carabidae

Narrow-necked harvest beetle

Anthicus floralis

Clover weevil

Sitona species

Rove beetle
Ground beetle
Narrow-necked harvest beetle
Clover weevil

Predatory mite

Gamasina

Predatory mite

Cheyletus eruditus

Predatory mite (Gamasina)
Predatory mite (Cheyletus eruditus)
×