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Welcome to the Pacific Northwest Nursery IPM Website

Newest pages: Clover mites and azalea sawfly gallery

Looking for trouble? Usually we begin to see the coreopsis beetle, pale green weevil up and feeding in May. Cottony camellia scale crawlers are out now. Young nymphs of azalea lace bug have been spotted. Keep an eye out for the first signs of roseslug. One can see the damage early this year from eriophyid mites such as pear leaf blister mite. Narcissus bulb flies are up around bulbs now. Honeylocust plant bug has been spotted. Adult flights have already been confirmed in our area for summer borers such as the Sequoia pitch moth and bronze birch borer. Aphids begin to show up on many deciduous hosts this time of year. Check for aphids on birches, maples, and beeches. Now is a good time to monitor for egg hatch of boxwood psyllid, egg hatch for boxwood spider mite and spruce spider mite, and adult emergence and feeding of barypeithes root weevils.

This is a key timing for disease prevention and monitoring too. Powdery mildew begins to show up with summer-like weather. It has been found on Cotinus or smokebush and dogwood. Azalea leaf and flower gall has been spotted. There are signs of brown rot, botrytis, bacterial blight, cedar-broom rust (and spores released from these Gymnosporangium rusts can infect roseacous hosts like serviceberry and pears, even Sorbus). Look for leaf blotch on peony.

Prior alerts: elm leafminer (April 19, 2016); Viburnum leaf beetle (April 11, 2016); spittlebugs (April 5, 2016); western tent caterpillar (Mar. 18, 2016); white pine weevil (Mar. 4, 2016); (pear blight beetle (Feb. 29, 2016)


This website has been established to provide educational materials and links for the identification and management of pests in commercial nursery production in the Pacific Northwest.

The PNW Nursery IPM Website is designed to be dynamic, allowing growers and pest management professionals to give and receive information regarding pest activities in nurseries in the Pacific Northwest. For more information on how this works, click on the Intro section of the website. The email Alert system is a free service sending out pest management information with regional, national, and international pest information pertinent to nursery production. Register here to receive email pest Alerts. Click here to view Pest Alerts.

New Pest activity alerts @PNWNurseryIPM at Twitter.com

This is a constantly expanding website. Many of our links are under construction and will develop further. Watch us grow.

New/Updated Sections

sapsucker damage

amber snails

Gymnosporangium rust on serviceberry
impatiens downy mildew

ash whitefly new
azalea lace bug
azalea sawfly new
birch aphid
boxwood psyllid
cottony camellia scale
dustywings new
maple aphids
March flies
Narcissus bulb fly
pear blight beetle
pine spittlebug new
meadow spittlebug
white pine weevil
western tent caterpillar

boxwood spider mites
clover mites new

Other resources:
Insectary plants
Phenological indicators of pest activity (in process)
Tips for Diagnostics

Find out more about OSU's Nursery, Greenhouse, and Christmas Tree Program OSU Nursery Greenhouse and Christmas Tree Program

Hold the Date!

Biological Control
Workshop & Tour

June 15 & 16, 2016
More info soon

While you are at it

Hold October!


Pest Management Workshops
for Greenhouse and Nursery Growers
Every Thursday in October





Website editor:
Robin Rosetta
Page last modified 5/23/16

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