Glabrous cabinet beetle
Trogoderma glabrum (Herbst)

Classification

Secondary pest: Grain feeder and scavenger
Order: Coleoptera
Family: Dermestidae
Acronym: TGL

Description

  • Adults are dark brown to black and covered with bicolourous or tricolourous pubescence on the elytra (other species of Trogoderma have only one or two colours of pubescence on the elytra).
  • Adults are oval, 2.0 to 4.2 mm long, have clubbed antennae and can fly.
  • Larvae are slightly oval shaped and covered in dense hairs.
  • Larvae are initially whitish yellow, but change to reddish brown as they mature.
  • Larvae have tufts of dense hair on their last abdominal segments.

Similar species

  • Other Trogoderma species

Commodities affected

  • Wheat, corn, cottonseed meal, bromegrass seed, barley, sorghum, soybean meal, wheat bran

Signs of infestation

  • Presence of cast larval skins, frass (excrement)
  • ‘Dead animal’ odour

Damage

  • Damage is initially only to the germ, then to the endosperm and bran later
  • Adults do not cause damage as they feed on nectar and pollen from flowers

How to control

Geographic range

  • Is found in Europe, Mexico, United States
  • Is found across Canada

Where found

  • Is found in granaries, flour mills and occasionally houses
  • in the U.S., it has been reported from stored wheat and corn (infests upper portion of grain bulk)

Life history

  • Eggs are laid singly on or near the food source.
  • Larvae are capable of diapause (dormant state), if conditions are unsuitable.

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