Home / Snout Moths (Pyralidae) / Zimmerman Pine Moth (Dioryctria zimmermani)

Zimmerman Pine Moth (Dioryctria zimmermani)

The Zimmerman pine moth is a member of the family of snout moths. As their name suggests, these moths, in their larval form are infamous for infesting pine trees mainly in the mid-west United States.

Zimmerman Pine Moth


Scientific Classification

  • Family: Pyralidae
  • Genus: Dioryctria
  • Scientific Name: Dioryctria zimmermani

Description and Identification


The larvae range from pink to green and are 25 mm long. Their heads are dark brown, and their bodies are covered with dark spots.

These caterpillars cause maximum damage to the pine trees, mainly the stressed or damaged ones, by tunneling through the branches and trunks.

Zimmerman Pine Moth Larva



After maturing, the larvae begin to pupate around mid-July to late August. They reach up to 18 mm in length.

Zimmerman Pine Moth Pupa


Adult Moth

Sexual Dimorphism: Present but not prominent.

Color and Appearance

Forewing: When opened, the wings are a combination of gray and reddish-brown, marked with light or dark zigzag lines. When the wings are closed, the color and pattern remain unchanged.

Hindwing: When the wings are opened, they are yellowish-white. When closed, the forewings are barely visible.

Average wingspan: 25-38 mm

Flight pattern: Erratic

Season: Late July to August

Dioryctria zimmermani



Once the mating season ends, females lay up to 80 eggs on the bark of the host plant.

Quick Facts

DistributionEast of the Rocky Mountains
HabitatMountainous areas
Lifespan of AdultsNot recorded
Host PlantsAustrian and Scots pines; also, Eastern white and mugo pines
Adult DietDoes not feed

Did You Know

  • British entomologist Augustus Radcliffe Grote first described this species in 1877.
Zimmerman Pine Moth Picture


Zimmerman Pine Moth Damage


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