Smalleyed flour beetle
Palorus ratzeburgii (Wissmann)


Secondary pest: fungus feeder and scavenger
Order: Coleoptera
Family: Tenebrionidae
Acronym: PRA


  • Adults are small reddish brown beetles 2.4 to 3 mm long.
  • Larvae are cylindrical and light brown.
  • Are one of the smallest flour beetles but can be distinguished by having the eye entire and not incised by the margin of the head.

Similar species

Commodities affected

  • Is found in stored grain, milled wheat, oat products, flour mills
  • Feeds on plant and dried animal products, especially grain and cereal products

Signs of infestation

  • Disagreeable odour in the commodity


  • Damage is not distinctive

How to control

Geographic range

  • Is found worldwide and across Canada

Where found

  • Is a mold feeder and scavenger
  • Is often associated with Sitophilus infestations where it feeds on the faeces of Sitophilus

Life history

  • Females lay eggs amongst the commodity.
  • Eggs are sticky and become coated with flour or grain dust.
  • Larvae move freely amongst the foodstuff.


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Did you know?

The smalleyed flour beetle feeds on damaged and mouldy grain.