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Pristiphora leechi Wong and Ross

  • Latin name: Pristiphora leechi Wong and Ross
  • French name:
  • Order: Hymenoptera
  • Family: Tenthredinidae


British Columbia

This species occurs throughout the host range in British Columbia; it also occurs south to Washington and Montana.



Damage, symptoms and biology

Pristiphora leechi is a common innocuous solitary defoliator.

Mature larva up to 13 mm long. Head, green with black eye-spots. Body, yellowish green with narrow dark green middorsal and broad subdorsal stripes.

Appears to overwinter in egg stage. Larvae are present from May to late June. Pupation occurs in late June and adults emerge in mid-July.

Canadian Forest Service Publications

Diet and feeding behaviour

  • Phyllophagous : Feeds on the leaves of plants.
    • Free-living defoliator: Feeds on and moves about freely on foliage.
Information on host(s)

Pristiphora leechi is restricted to western larch.

Main host(s)

Western larch

Secondary host(s)

Black cottonwood, Engelmann spruce, Rocky Mountain Douglas-fir, Sitka alder, tamarack, western white pine


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