Khapra beetle
Trogoderma granarium Everts

Classification

Primary pest; grain feeder; quarantine pest
Order: Coleoptera
Family: Dermestidae
Acronym: TGR

Similar species

  • Other Trogoderma species

Commodities affected

  • Grains and oilseeds, maltings, dried vegetable seeds

Signs of infestation

  • Initial discoveries are often based on the presence of accumulations of cast larval skins

Damage

  • Larvae initially feed on damaged grain pieces.
  • As larvae mature, they are able to attack whole grains.
  • Larvae may completely destroy commodity.

How to control

Geographic range

  • Is not established in Canada and is a quarantine pest
  • Thrives in hot, dry climates

Life history

  • Females lay eggs amongst the commodity.
  • Larvae may enter diapause (dormant state) and remain inactive for up to 8 years if conditions are unfavourable.
  • diapause may be initiated by cooler temperature, poor food quality or low population densities.
  • Larvae moult multiple times and duration of life cycle depends on conditions.
  • If conditions are favorable, life cycle is shorter in duration with fewer molts.
  • Adults cannot fly.
  • Adults do not feed.
  • Beetle only has competitive advantage in hot dry grain where other more prevalent species do not have the advantage they have when humidity is normal.

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