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 bean aphid new
black cherry aphids new
black stem borer
bluegum psyllid
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid updated
bulb flies
cabbage whitefly new
carpet beetle (images)
Calligraph californica

Ceanothus stem gall moth
cereal leaf beetle
cherry ermine moth
chilli thrips
cinnabar moth
clay colored weevil
cottony camellia scale
cypress tip moth
dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
dustywings new
elm leafminer
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
flatheaded cedar borer
ground beetle gallery new
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
Japanese beetle new
lacewings new
lady beetle gallery updated
leaf weevil
light brown apple moth
maple aphids updated
maple tip moth
maple midge
March flies updated
mountain ash sawfly
Narcissus bulb fly updated
Natural enemies gallery new
spruce twig aphid
oak ambrosia beetle
oak slug
oak twig gall wasp new
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
Psyllopsis fraxinicola updated
rose curculio weevil
rose midge
rove beetle gallery new
sequoia pitch moth
soldier beetle galleryn new
snakefly gallery new
speckled green fruitworm
meadow spittlebug updated
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil updated
woolly ash aphid
woolly beech aphid updated

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Rose curculio weevil

The rose curculio, Merhynchites (=Rhynchites) bicolor can be found feeding on rosacious hosts including wild and domestic roses; blackberries, raspberries, and thimbleberries thoughout the northwest. These variably-colored beetles can range from a bright lacquer red to all black. They have a very long snout, useful to penetrate buds for feeding and laying eggs.

In western Oregon a population of adults were noted during the week of May 7th, 2007. They were aggregated near the buds and flowers of thimbleberry.

Further information about rose curculio can be found at these websites:

Baldo Villegas' Rose Weevils (Curculios) website is one of the most thorough available with great pictures and helpful lifecycle information.

Nanette Londeree also has nice images of the rose curculio and damage on roses in her web article, Garden Bad Guys - rose curculios.

Cool pictures at the BugGuide website.

Hamilton, R.W. and S.S. Kuritsky. 1981. Description of the larvae and pupa of Merhynchites bicolor (Fabricious)(Coleoptera: Rhynchitidae). The Coleopterists Bulletin 35(2), 1981. <5 May 2016>


Orginal publication: 5/14/2007
Latest publication: 5/5/2016


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


Rose curculio weevil adult
rose curculio weevil adult
Rose curculio weevil adults on flower bud
rose curculio adults on bud
Rose curculio adult closeup
rose curculio adult

Rose curculio weevil bud damage. Note the two holes in the bud on the left and the dead bud on the right (stem damage)
rose curculio damage on buds
Rose curculio weevil damage to blossom
rose curculio weevil damage on blossom
Website editor:
Robin Rosetta

Page last modified 5/5/16


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