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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Entomopathogenic nematodes

Entomopathogenic or beneficial nematodes have been used quite successfully for insect management. In Pacific Northwest nursery production they are used primary for suppression of root weevil, thrips, and fungus gnat larvae.

For root weevil suppression, insect parasitic nematodes are used for the soil-dwelling stage of the weevils. Drenches weevils species such as black vine weevil, strawberry root weevil, and rough strawberry root weevil are timed for the late spring-early summer prior to emegence of adult weevils or applied in the late summer-early fall to manage the young weevils the emerge from summer-laid eggs. These drenches should be applied when soil temperatures are sufficiently warm (at least 55-60 degrees F) for survival and activity of the nematodes.

Nematodes may be applied in various ways including with a bucket or watering can, or through overhead and drip irrigation lines (remove screens). Nematodes generally work best in container substrates but field releases may help to suppress nematodes. Pulling back mulch or plant debris can increase the efficacy of the drenches when applied in the field. WSU entomologist Lynell Tanigoshi (now retired) saw the infection rate for larval and pupal stages of root weevils, 12 days after receiving insect parasitic nematode drenches, increase from 13.2% to 58.4% when debris was removed compared to no removal prior to the applications in strawberries.

Want more information on entomopathogenic nematodes? There are several useful sites with information about using nematodes for insect management.

An updated resource Pacific Northwest Extension Publication, PNW 544, Using Entomopathogenic Nematodes for Crop Insect Pest Control is nice place to start learning about use of nematodes for pest control. The authors are Carol Miles, Caitlin Blethen, Randy Gaugler, David Shapiro-Ilan, Todd Murray. Revised May 2012. <21 September 2017>

W.S. Cranshaw and R. Zimmerman. 2013. Insect Parasitic Nematodes. Colorado State University Extension. 5/94. Revised 6/23. <21 September 2017>

Dreves, A. and J. Lee. 2015. Entomopathogenic Nematodes. PNW Insect Management Handbook. March 2015. <21 September 2017>

Barbercheck. M. 2015. Insect Parasitic Nematodes for the Management of Soil-Dwelling Insects. Penn State College of Agricultural Sciences. March 2015. <21 September 2017>

We held a very hands-on workshop in Oregon that has practical information particulary concerning application techniques
Proceedings of the Beneficial Nematode Workshop, Sept. 7, 2000. NWREC, Aurora, OR <21 September 2017>

Wainwright, S. 2017. Where to buy "THE GOOD BUGS": Supplier beneficial insects, mites and nematodes for commercial growers. Buglady Consulting. <21 September 2017>

Just for fun, check out the following creative website about nematodes
Imaginemas <21 September 2017>


Original version: <26 July 2012)

Last update <9 September 2017>

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

Website editor:
Robin Rosetta

Page last modified 7/26/12


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