Ahasverus
Gozis, 1881
Species Guides
4- Ahasverus advena(Foreign grain beetle)
- Ahasverus longulus
- Ahasverus new
- Ahasverus rectus
Ahasverus is a of beetles in the Silvanidae. The genus is best known for Ahasverus advena (foreign grain ), a stored product pest found in 110 countries. Ahasverus are primarily fungal feeders, with larvae capable of developing on fungi alone. The genus includes at least two other species found in stored products, though A. advena dominates ecological and economic literature.
Pronunciation
How to pronounce Ahasverus: /ˌɑː.hasˈveɪ.rəs/
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Images
Habitat
Stored products including grain bins, elevators, mills, and warehouses; also found in compost heaps, haystacks, manure, wall voids, crawl spaces, and attics with high humidity supporting fungal growth. Field include ripening grain and rotting corn ears.
Distribution
distribution with records from North America, South America, Europe, Africa, Asia, and Oceania. Specific distribution records exist for Denmark, Norway, and Sweden.
Diet
Fungi (primary food source; larvae can develop on fungi alone); grain and cereal products; dried fruits; oilseeds; spices; herbs; medicinal plants; animal feed. Some are predatory.
Life Cycle
laid on fungal supporting offspring development; egg-to- development in 15–62 days depending on fungal species; larvae develop on fungi alone; possible in heated compost, haystacks, and manure in cold climates.
Behavior
Strong fliers capable of locating moldy grain from distance; attracted to fungal odors and high-moisture commodities; can disseminate grain fungi causing hot spots within grain mass; migrate to artificially created hot spots.
Ecological Role
Fungal feeder adapted to disseminate grain fungi causing hot spots; indicator of poor storage conditions; potential for ; may contribute to grain spoilage and aflatoxin spread.
Human Relevance
Major stored product pest causing economic losses; presence sufficient for load rejection in countries with zero for insects; listed as pest in India; frequently submitted for identification by extension agents.
Similar Taxa
- CathartusBoth in Silvanidae with similar flattened body forms and association with stored products; Ahasverus distinguished by specific antennal and pronotal characteristics not detailed in available sources.
- OryzaephilusConfamilial silvanid grain pests; Oryzaephilus (sawtoothed and merchant grain beetles) are more economically damaging primary pests, while Ahasverus is fungus-associated and often secondary.