Home / True Weevils (Curculionidae) / Douglas Fir Beetle (Dendroctonus pseudotsugae)

Douglas Fir Beetle (Dendroctonus pseudotsugae)

The Douglas fir beetle is a curculionidae beetle and a member of the subfamily of bark beetles.

Douglas Fir Beetle

Scientific Classification

  • Family: Curculionidae
  • Genus: Dendroctonus
  • Scientific name: Dendroctonus pseudotsugae

Physical Description and Identification

Adult

Size: 4.4 to 7 mm

Color: They start as light brown, becoming black or dark brown as time goes on. The elytra are reddish.

Other Characteristic Features: These beetles are hairy.

Dendroctonus pseudotsugae

Larva

Larvae are white, legless, and the size of a rice grain.

Douglas Fir Beetle Larva

Pupa

The pupae are cream or white.

Egg

Eggs are laid on either col3 of 6 – 30 inch galleries present incol3 the bark of the host plant.

Douglas Fir Beetle Eggs

Quick Facts

LifespanNot recorded
Distributionwestern North America
HabitatRocky mountain slopes
Seasons activeApril, May, or early June
PredatorsClerid beetles and Dolicopdid flies
Host plantsDouglas firs; also downed Larch trees
Diet of adultsDoes not feed
Douglas Fir Beetle Damage

Identifying the Damage Caused by Them

A Douglas-fir beetle attack can be characterized by patches of orange to reddish-brown boring dust in the bark of an infected tree. Higher up in the tree, resin streams are also observed.

Did You Know

  • While a pest, this beetle also plays a significant role in maintaining the ecosystem by eliminating older and weaker trees.
Douglas Fir Beetle Picture

Image Source: summerlandreview.com, i2.wp.com, bugwoodcloud.org, entomologytoday.org, amazonaws.com, bugwoodcloud.org

The Douglas fir beetle is a curculionidae beetle and a member of the subfamily of bark beetles.

Douglas Fir Beetle

Physical Description and Identification

Adult

Size: 4.4 to 7 mm

Color: They start as light brown, becoming black or dark brown as time goes on. The elytra are reddish.

Other Characteristic Features: These beetles are hairy.

Dendroctonus pseudotsugae

Larva

Larvae are white, legless, and the size of a rice grain.

Douglas Fir Beetle Larva

Pupa

The pupae are cream or white.

Egg

Eggs are laid on either col3 of 6 – 30 inch galleries present incol3 the bark of the host plant.

Douglas Fir Beetle Eggs

Quick Facts

LifespanNot recorded
Distributionwestern North America
HabitatRocky mountain slopes
Seasons activeApril, May, or early June
PredatorsClerid beetles and Dolicopdid flies
Host plantsDouglas firs; also downed Larch trees
Diet of adultsDoes not feed
Douglas Fir Beetle Damage

Identifying the Damage Caused by Them

A Douglas-fir beetle attack can be characterized by patches of orange to reddish-brown boring dust in the bark of an infected tree. Higher up in the tree, resin streams are also observed.

Did You Know

  • While a pest, this beetle also plays a significant role in maintaining the ecosystem by eliminating older and weaker trees.
Douglas Fir Beetle Picture

Image Source: summerlandreview.com, i2.wp.com, bugwoodcloud.org, entomologytoday.org, amazonaws.com, bugwoodcloud.org

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