Contents: By Damage and Image
(In progress)
Contents: Alphabetical
alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly new
azalea bark scale
azalea lace bug Updated
bark lice
Barypeithes root weevil
Beneficial nematodes
biocontrol of root weevils
birch aphid
black stem borer
bluegum psyllid
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid
bulb flies
carpet beetle New
Calligraph californica

Ceanothus stem gall moth
cereal leaf beetle
cherry ermine moth
chilli thrips
cinnabar moth
clay colored weevil
cottony camellia scale
cutworm Updated
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine shoot moth
European shot-hole borer Updated
European wool carder bee
emerald ash borer
Fall webworm
flatheaded cedar borer
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
lady beetle gallery
leaf weevil
light brown apple moth
maple tip moth
maple midge
March flies
mountain ash sawfly
spruce aphid on spruce
oak ambrosia beetle
oak slug
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear psylla
pear leaf-curling midge
pear sawfly New
pine needle scale
poplar and willow borer
rose curculio weevil
rose midge
sequoia pitch moth
speckled green fruitworm
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil
woolly ash aphid

Back to Home

Contact Us

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


Before applying any of the information found on this site, please read our disclaimer.
Copyright © 2015, All Rights Reserved