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
azalea sawfly New
bark lice
Barypeithes root weevil Updated
Beneficial nematodes
biocontrol of root weevils
birch aphid Updated
black stem borer
bluegum psyllid
borers
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid Updated
bulb flies
carpet beetle (images)
Calligraph californica
caterpillars

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

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
earwigs
elm leafminer
European pine shoot moth
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
lacebugs
lady beetle gallery
leaf weevil
light brown apple moth
maple aphids Updated
maple tip moth
maple midge
March flies Updated
mountain ash sawfly
Narcissus bulb fly Updated
spruce aphid on spruce
oak ambrosia beetle
oak slug
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle Updated
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug New
poplar and willow borer
rose curculio weevil
rose midge
roseslug
sawflies
scale
sequoia pitch moth
speckled green fruitworm
meadow spittlebug updated
tent caterpillars
thrips
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil Updated
whiteflies
woolly ash aphid
woolly beech aphid Updated

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Roseslug

There are several sawfly species that feed on roses. The common roseslug, Endelomyia aethiops, can be found skeletonizing rose leaves in late spring and early summer. This species, along with the bristly roseslug, Cladius difformis, belong to the family Tenthredinidae. The larvae look similar to caterpillars but are actually more closely related to bees and wasps. The common roseslug is pale green with a light tan head capsule. The bristly roseslug has many hairlike bristles. Along with three pairs of true legs, they have three pairs of abdominal legs which lack the hooked crochets on the prolegs of true caterpillars. The adult sawflies are small, thick-waisted wasps, mostly black in color.

Damage
Initial feeding damage is usually found in May or June in the PNW and consists of tiny areas of clear tissue. With time, the roseslug feeding creates a distinctive windowpanelike damage. The larvae feed on the underside of the leaves.

Management
Cultural control includes hand picking and disposing of infested leaves. There are a range of chemical control options including biorationals such as insecticidal soaps and horticultural oils. Direct contact is necessary. Products such as Conserve or Entrust (OMRI or organic formulation) with spinosad have good activity on sawflies (bee warning). For landscape applications (no nursery label), Acelepryn has give activity and less risk to pollinators. Although they look like caterpillars, they are not affected by Bt sprays as are the larvae of moths and butterflies. Pay attention to bee safety when affected roses are in flower.

Links:

Sacramento Rose Society: Rose sawflies. There are great images and information on the different types of rose sawflies found in Northern California and Oregon.

UC Irvine, Bristly roseslug, Cladius difformis. Wonderful images of bristly roseslug sawflies, particularly adults at this website.

Images of the adult roseslug can be found at the Biodiversity Database of Washington DC website.

 

Orginal publication: 6/3/2009
Latest publication: 5/6/2016

 

Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University

 

Gallery
Roseslug larva under rose leaf
roseslug larva
Early roseslug feeding damage

Leaf skeletonizing damage caused by roseslug feeding
roseslug damage
Roseslug pupa
roseslug pupa
Photo: Ken Gray
Bristly roseslug larva
bristly roseslug larva
Photo: Ken Gray
Bristly roseslug cocoon
bristly roseslug cocoon
Photo: Ken Gray
Bristly roseslug adult
bristly roseslug adultPhoto: Ken Gray
Website editor:
Robin Rosetta

Page last modified 5/6/16

 

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