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

bronze birch borer
boxwood leafminer
boxwood psyllid Updated
bulb flies
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
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
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
sequoia pitch moth
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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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 Amelanchier, cherries, crabapple, hawthorn, Norway, red, and Japanese maples, mountain ash, purple leaf plum, and viburnum


First Detectors Pest Thrips of the United States - Field Identification Guide.

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.

The University of Minnesota hosts a nice intro and key to identification of common thrips and also has another nice web publication for greenhouses: Western Flower Thrips in Commercial Greenhouses

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.

The Online Guide to Plant Disease has great information on managing two key viruses vectored by thrips: Impatiens Necrotic Spot: New Name, Same Threat; Impatiens -- Impatiens Necrotic Spot; Greenhouse Plants, Ornamental -- Impatiens Necrotic Spot

An examination of the literature and current research efforts concerning thrips and virus management can be found at this Management Strategies for Thrips and Tospoviruses
on Cut Flower/Specialty Crops, Potted Crops
and Bedding Plants site

The New Zealand Plant Protection Society has a useful website discussing Thrips insecticide resistance management and prevention strategy. Many of the strategies might be of use in our systems.

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)


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

Page last modified 5/22/14


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