Home / Silvan Flat Bark Beetles (Silvanidae) / Foreign Grain Beetle (Ahasverus advena)

Foreign Grain Beetle (Ahasverus advena)

Foreign grain beetle of the sylvan flat bark beetle family is found in the tropical and temperate areas. They mostly infest grains, oilseeds, spices, cereals, and dried fruits, particularly those that have gotten a little moldy, hence the name.

Foreign Grain Beetle

Scientific Classification

  • Family: Silvanidae
  • Genus: Ahasverus
  • Scientific name: Ahasverus advena

Physical Description and Identification

Adult

Size: 2 mm

Color: They are mostly reddish-brown but can even appear black at times.

Other Characteristic Features: These beetles have a flat body with club-shaped antennae and knobs projecting from each end of its pronotum.

Foreign Grain Beetle Picture

Larva

They closely resemble a worm and have a cream body.  

Foreign Grain Beetle Larvae

Pupa

No detail is available regarding the foreign grain beetle pupa. However, they grow to about 3mm after entering the pupal phase and finally mature into adults.

Egg

The females lay eggs 3 or 4 days after the completion of the pupal phase. The eggs are laid in 2 – 3 clusters and hatch within 4 – 5 days.

Quick Facts

Lifespan of Adults5 – 10 months
DistributionTemperate and tropical regions
HabitatGrain storage facilities, old homes near damp, moist walls or humid bathroom that is a breeding place for fungi, humid bathrooms, or even in spoiled food
Common PredatorsParasitic wasps, spiders, and several other insects
Seasons active fromAugust – September  
Diet  of larvae and adultsDead insects, fungus, grains
Ahasverus advena

Identifying the Damage Caused by Them

They are harmless and do not damage furniture or food grains. However, their infestation is an indication of damp and moist storage conditions.

The best and easiest way to control them is by eliminating any dampness in the surrounding since they either go away or die when the humidity is less than 60%.

Did You Know

  • It is related to another beetle of its family, the sawtoothed grain beetle, also known to infest food grains, alongside tobacco, chocolates, and drugs.
Foreign Grain Beetle Images

Image Source: grainscanada.gc.ca, media.padil.gov.au, plunketts.net, bugguide.net, canr.msu.edu

Foreign grain beetle of the sylvan flat bark beetle family is found in the tropical and temperate areas. They mostly infest grains, oilseeds, spices, cereals, and dried fruits, particularly those that have gotten a little moldy, hence the name.

Foreign Grain Beetle

Physical Description and Identification

Adult

Size: 2 mm

Color: They are mostly reddish-brown but can even appear black at times.

Other Characteristic Features: These beetles have a flat body with club-shaped antennae and knobs projecting from each end of its pronotum.

Foreign Grain Beetle Picture

Larva

They closely resemble a worm and have a cream body.  

Foreign Grain Beetle Larvae

Pupa

No detail is available regarding the foreign grain beetle pupa. However, they grow to about 3mm after entering the pupal phase and finally mature into adults.

Egg

The females lay eggs 3 or 4 days after the completion of the pupal phase. The eggs are laid in 2 – 3 clusters and hatch within 4 – 5 days.

Quick Facts

Lifespan of Adults5 – 10 months
DistributionTemperate and tropical regions
HabitatGrain storage facilities, old homes near damp, moist walls or humid bathroom that is a breeding place for fungi, humid bathrooms, or even in spoiled food
Common PredatorsParasitic wasps, spiders, and several other insects
Seasons active fromAugust – September  
Diet  of larvae and adultsDead insects, fungus, grains
Ahasverus advena

Identifying the Damage Caused by Them

They are harmless and do not damage furniture or food grains. However, their infestation is an indication of damp and moist storage conditions.

The best and easiest way to control them is by eliminating any dampness in the surrounding since they either go away or die when the humidity is less than 60%.

Did You Know

  • It is related to another beetle of its family, the sawtoothed grain beetle, also known to infest food grains, alongside tobacco, chocolates, and drugs.
Foreign Grain Beetle Images

Image Source: grainscanada.gc.ca, media.padil.gov.au, plunketts.net, bugguide.net, canr.msu.edu

Leave a Reply

Your email address will not be published.