Contents: By Damage and Image
In progress
Contents: Alphabetical

alder flea beetle
aphid management
apple and thorn skeletonizer
apple ermine moth
ash whitefly
azalea bark scale
azalea lace bug
azalea sawfly
Bagrada bug
bark lice
Barypeithes root weevil
Beneficial nematodes
biocontrol of root weevils
birch aphid
black bean aphid
black cherry aphids
black stem borer
bluegum psyllid
Boisduval scale
branch and twig borer
brown marmorated stink bug

bronze birch borer
boxwood leafminer
boxwood psyllid
bulb flies
cabbage whitefly
carnation tortrix
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

crane flies
cypress tip moth

dogwood sawfly
Douglas fir sawfly
Douglas fir twig weevil
elm leafminer
European pine sawfly new
European pine shoot moth
European wool carder bee
emerald ash borer
Fall webworm
fir coneworm new
flatheaded cedar borer
ground beetle gallery
Hemerocallis gall midge new
hollyhock weevil
honeylocust plant bug
honeylocust pod gall midge
Heliothis phloxiphaga
holly bud moth
huckleberry root aphids
ground mealybug
Japanese beetle
lady beetle gallery
leaf weevil
light brown apple moth
Linden aphid new
lupine aphid new
Macrosiphum rhamni new
maple aphids
maple tip moth
maple midge
March flies
mountain ash sawfly
Myzocallis sp. on red oak new
Narcissus bulb fly
natural enemies gallery
oak ambrosia beetle
oak slug
oak twig gall wasp
obscure root weevil
Pacific flatheaded borer
peach tree borer
peach twig borer
pear blight beetle
pear psylla
pear leaf-curling midge
pear sawfly
pine needle scale
pine and cone spittlebug
poplar and willow borer
Psyllopsis fraxinicola
rose curculio weevil
rose midge
rove beetle gallery
rose stem girdler
sequoia pitch moth
soldier beetle gallery
snapdragon plume moth new
snakefly gallery
speckled green fruitworm
meadow spittlebug
spotted asparagus beetle
spruce twig aphid
tent caterpillars
viburnum leaf beetle
violet gall midge
western poplar clearwing
western spotted cucumber beetle
white pine weevil
woolly alder aphid new
woolly ash aphid
woolly beech aphid

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Thrips are insects in the order Thysanoptera. Western flower thrips, Frankliniella occidentalis, is one of several thrips that can be damaging to ornamental crops. During the summer months when nearby crops are harvested, large migrations of thrips into productions areas can occur. These populations of thrips can be large enough to cause extensive damage to susceptible plants, including terminal losses and stunting. We've had reported damage from azaleas, Amelanchier, cherries, chrysanthemum, crabapple, hawthorn, gerbera, laurel, Norway, red, sugar and Japanese maples, mountain ash, purple leaf plum, and viburnum


Thrips of California 2012 Lucid key is a very robust key with many of thrips that might also occur in the PNW. Best to use if you have a slide mounted specimen.

Western Flower Thrips

North Carolina State University's Insect Notes: Western Flower Thrips

The Integrated Plant Protection Center, Oregon State University: Western Flower Thrips has information and phenology useful for Oregon growers.

UC IPM Online Pests in the Landscapes and Gardens: Thrips has some very nice information on monitoring and management.

From UC Riverside - Western Flower Thrips in Greenhouses: A Review of its Biological Control and Other Methods. An absolutely fantastic guide for those interested in biological control.

Pacific Northwest Plant Disease Management Handbook has great information on managing two key viruses vectored by thrips: Impatiens -- Impatiens Necrotic Spot; Greenhouse Plants, Ornamental -- Impatiens Necrotic Spot

Canas, L. 2016. Managing Thrips Resistance to Insecticides. Greenhouse Product News. <2 June 2016>

Cal Ag's article on IPM Works in California Greenhouse Cut Roses discusses thrips management. A PDF with images can be downloaded from the site.

Chili thrips

Poinsettia thrips (Echinothrips americanus)


Orginal publication: 8/3/2004
Latest publication: 6/2/2016


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



Terminal distortion and blackening on sugar maple from thrips feeding
Thrips damage to sugar maple
Misshapenleaves and blackened tissue on sugar maples
thrips damage on sugar maple
Leaf cupping and blackening of leaf edges on 'Winter King' hawthorn from thrips feeding
thrips damage on hawthorn
Tip death and leaf distortion on hawthorn from thrips feeding
thrips damage on hawthorn terminal
Two thrips feeding in hawthorn terminal causing tissue blackening and necrosis
thrips damage hawthorn
Thrips larva on plum terminal leaf
thrips larva on plum
Thrips damage on plum terminal
thrips damage on plum
Adult western flower thrips on red maple terminal
thrips on terminal growth
Severe thrips damage on red maple.
severe thrips damage
Dramatic effect of cultivar on susceptibility - 'Bowhall' maple on left.
cultivar susceptibility to thrips
Stunting and distorted growth in 'Kwanzan' cherry
thrips damage on cherry
Thrips damage on English laurel
thrips damage on English laurel
Thrips damage on viburnum terminal.
thrips damage on vigurnum
Thrips damage on new growth of Japanese maple
thrips damage on Japanese maple
Close-up of thrips and feeding damage on new growth of Japanese maple
thrips and feeding damage
Thrips on new growth of Japanese maple
thrips on Japanese maples
Website editor:
Robin Rosetta

Page last modified 6/2/16


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