Foreign grain beetle
Ahasverus advena (Walt)
Secondary pest: fungus feeder
- Foreign grain beetle is a small brown beetle, about 2 mm in length. It is superficially similar to the rusty grain beetle.
- Larvae are very small and are whitish to yellow in colour.
- Adults are able to climb glass walls of jars, unlike Cryptolestes spp.
- Rusty grain beetle (Cryptolestes ferrugineus).
- Foreign grain beetle can be distinguished from the rusty grain beetle by the presence of clubbed antennae and projections on the front edge of the pronotum (also called nubs and clubs)
- Flat grain beetle (Cryptolestes pusillus)
- Flour mill beetle (Cryptolestes turcicus)
- Sawtoothed grain beetle (Oryzaephilus surinamensis)
- Merchant grain beetle (Oryzaephilus mercator)
- Long headed flour beetle (Latheticus oryzae)
- Small-eyed flour beetle (Palorus ratzeburgii)
- Hairy fungus beetle (Typhaea stercorea)
- Grain, cereal products, oilseeds, dried fruit, herbs, spices
Signs of Infestation
- Heated, damp grain with mould present
- Grain injury is generally not sufficient to cause economic losses.
- Contamination by insect is an issue.
- Presence of beetles is an indication of out of condition grain or poor storage conditions.
How to control
- Is found across Canada and throughout the world
- Is the most common fungus grain beetle found in the prairie provinces
- Is found in mills, warehouses and granaries and is an indication of mouldy grain and moist storage conditions
- Is frequently present in the field at harvest and is subsequently transferred into bins
- Females lay eggs singly, occasionally lay them in clusters of 2 or 3
- Larvae form chambers of food particles cemented together
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