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bronze birch borer
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dogwood sawfly
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spruce aphid on spruce
oak ambrosia beetle
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obscure root weevil
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Oak Slugs
The larvae of sawfly species, oak slugs, get their name from their resemblance to the legless molluscs, slugs, but are actually in the insect family Tenthredinidae in the order Hymenoptera which includes bees and wasps. Like similar species of sawflies on rose or pears, the larvae can be found skeletonizing leaf surfaces, usually feeding on the underside of leaves. Although the species in this image is yet to be confirmed, it is thought to be either Caliroa distincta or Caliroa labata, two species confirmed in Washington state.

Feeding damage from the larvae has been spotted in early July in the North Willamette Valley. Look on lower leaves for first damage as these sawflies probably overwinter in the soil below the trees.

 

Web resources:
USDA-Forest Service, Northeastern Region. Scarlet Slug Oak Sawfly

Ohio State University. Scarlet Oak (Slug) Sawfly

Oak slug damage on seedling oak
oak slug damage
Photo: Rosetta, Oregon State University
Oak slug damage on upper leaf surface
oak slug damage on leaf surface
Photo: Rosetta, Oregon State University
Oak slugs and damage on leaf underside
oak slugs and feeding damage on leaf underside
Photo: Rosetta, Oregon State University
Two oak slugs feeding on leaf underside
two oak slugs feeding on leaf underside
Photo: Rosetta, Oregon State University
Website editor:
Robin Rosetta

Page last modified 7/16/12

 

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