Pacific Northwest Vegetable Extension Group

of Washington State University, Oregon State University, and University of Idaho

PNW-VEG Objectives (Poster)

  • Assist with diagnoses of vegetable diseases, pests, and other problems
  • Coordinate vegetable disease, pest, and production research and extension activities in the Pacific Northwest
  • Provide growers and gardeners with resources to manage vegetable diseases, pests, and abiotic problems in environmentally-sound ways
  • Publish new information about vegetable pathogens, pests and other problems; and their biology and management
  • Serve the region’s fresh vegetable, processing vegetable, and vegetable seed crop industries

Several new vegetable extension bulletins published by members of the Pacific Northwest Vegetable Extension Group are shown above. These publications, and others, can be found on the Publications page of our website.

Vegetable Resource Highlights

  • At the Sept. 11. 2014 Crucifer Disease Meeting in Oregon three presentations were given to update stakeholders on the current situation in the Willamette Valley for black leg, light leaf spot, and white leaf spot in crucifer crops. Powerpoint presentations by Cindy Ocamb (OSU), Nancy Osterbauer (ODA), and David Priebe (ODA), are available here in PDF versions.
  • Black Leg, Light Leaf Spot, and White Leaf Spot, Cynthia Ocamb, PhD., Plant Pathologist, OSU Extension, Associate Professor--Botany & Plant Pathology.
  • Addressing Blackleg in the Willamette Valley - Temporary rule and proposed changes to the permanent rule of the Oregon Department of Agriculture, Nancy K Osterbauer, State of Oregon, Oregon Department of Agriculture, Plant Protection and Animal Health.
  • Fungicides for Control of Black Leg, David Priebe, Pesticides Program, Oregon Department of Agriculture.

  • Alert: Black leg in Brassicaceae Crops and Wild Crucifers. A widespread epidemic of black leg occurred on a diversity of crucifer oilseed, cover, forage, and vegetable seed crops in the Willamette Valley of Oregon in spring 2014. Black leg can be a significant problem for growers of fall- or spring-sown plantings of various crucifer crops, particularly under the favorable environmental conditions for this disease in the Pacific Northwest. Phoma lingam (sexual stage: Leptosphaeria maculans) is the fungus that causes black leg. In fact, back leg is a quarantine disease for five counties in northwestern Washington. Brassicaceae plants that can be infected include species of Brassica (e.g., broccoli, Brussels sprouts, cabbage, canola, cauliflower, various Chinese brassica vegetables, collard, kale, mizuna, mustard, oilseed rape, oilseed turnip rape, rutabaga, turnip, etc.), Sinapis (white and yellow mustard), and Raphanus (daikon and radish). Several wild species exist that may be infected by P. lingam.
    Read Full Alert...

  • WANTED DEAD OR ALIVE: Stink Bugs Still At Large in Washington State. In 1988, a statewide survey revealed 23 species of stink bug in Washington.  In 2014, this number was increased to 47 species including the invasive and dreaded Brown Marmorated Stink Bug (middle image) that was found in a handful of counties. We have reasons to believe more stink bugs exist in Washington State. If you capture any bug that resembles a stink bug, WSU Extension desperately needs the specimen mailed to us along with information that provides us with where (the town or county or GPS location captured), when (date) and on what host plant they were found on.
    For the details, go HERE.

    Disease Alert Light Leaf Spot in Crucifer Seed Fields in the Willamette Valley. Beginning late March 2014, I found several leaf spot diseases in fall-sown crucifer crops and weedy species in the Willamette Valley. A survey in OSU research fields of fall-sown canola during late October in 2013 showed no leaf spots or seed/seedling diseases. However, light leaf spot caused by the fungus Cylindrosporium concentricum (sexual stage: Pyrenopeziza brassicae) was observed causing disease this spring in canola research fields as well as in commercial seed fields of forage Brassica species and field turnip. Light leaf spot was subsequently detected in other Brassica members including wild mustard, volunteer black mustard, vegetable Brassica seed fields, and Brassica species used as cover crops during 2014. While the specific host range for C. concentricum within the tribe Brassiceae is unknown at this time, it is likely that all brassicas crops grown in the Pacific Northwest are susceptible (1) with a range of susceptibility within each crop species. This disease hasn't been previously reported in North America, although an infected mustard field was found in western Oregon during 1998. Oilseed rape can be very susceptible with losses resulting from stand die-out, reduced pod numbers, and premature pod ripening; with less severe infections there is an overall growth reduction. Brassica species grown as vegetables in other areas of the globe, where this disease has been reported, suffer blemish defects that result in a decrease in quality but not quantity of yield.
    Read Full Alert...

    Disease Alert – White Leaf Spot in Crucifer Seed Fields in the Willamette Valley.
    White Leaf Spot and Gray Stem in Crucifer Seed Crops in Western Oregon, 2014 Beginning late March 2014, I found several leaf spot diseases in fall-sown crucifer crops and weedy species in the Willamette Valley. A survey in OSU research fields of fall-sown canola during late October 2013 showed no leaf spots or seed/seedling diseases. However, white leaf spot and gray stem caused by the fungus Pseudocercosporella capsellae (sexual stage: Mycosphaerella capsellae) were observed during 2014 in canola research fields as well as in commercial seed fields of forage Brassicas and “field” turnip. White leaf spot was also detected in volunteer black mustard and forage fields. Susceptible hosts reportedly include species of Brassica (broccoli, cabbage, canola, cauliflower, Chinese cabbage, mustard, turnip, etc.) as well as radish and horseradish. Weedy types such as wild radish, wild mustard, and shepherd's purse are susceptible to white leaf spot and gray stem.
    Read Full Alert...
    Potato Pest Alert 2014-22: This is the 22nd potato pest alert issued for the 2014 growing season.

    LATE BLIGHT: Dennis Johnson's late blight information line was updated on September 12th.  Late blight was found this season southwest of Mesa, north of Eltopia and west of Hermiston.  The strain in Franklin County is US 8.  This is the A2 mating type and is metalaxyl (Ridomil) resistant.  Harvest only during dry weather and when vines are dry. Inspect tubers in storage for rot, especially during the first six weeks of storage. Please contact Dennis Johnson at 509-335-3753 to report, confirm, or make a late blight diagnosis.  They need isolates to determine the strain from other locations in the Northwest.  The hotline number is 1-800-984-7400.

    Read Full Alert

  • New ‘Tomato MD’ App Helps Users Diagnose and Treat Sick Tomato Plants: Tomatoes are one of the most common crops in the U.S. But while popular, they are not always easy to treat when affected by plant diseases or bugs. With such a wide range of pests that affect tomato plants, growers can have a difficult time identifying and treating them.

    Enter Tomato MD, part of the new “Plant Health” family of apps for the iPhone or iPad. Tomato MD is an interactive reference that helps gardeners, professional growers, and consultants identify and manage more than 35 key diseases, insects, and physiological disorders of tomatoes.

    Tomato MD is unique in that tomato experts have peer-reviewed all content to ensure the images and information are accurate. And while the information was reviewed by scientists, it is very accessible and published in an easy-to-use, non-scientific format.

    Fact Sheet: Food Safety and Modernization Act (FSMA) Proposed Rule for Produce Safety: Standards for the Growing, Harvesting, Packing, and Holding of Produce for Human Consumption. The FDA’s website provides some highlights about the rule, who the rule covers, compliance information, and where to go for more information. This proposed rule has major potential ramifications for freshly consumed foods, including many vegetables.

  • Bacterial Ring Rot on Potatoes. Washington State University Extension Bulletin. This publication provides information on the bacterial ring rot pathogen, its disease cycle, and ring rot management on potatoes.

  • Production of Brassica Seed Crops in Washington State: A Case Study on the Complexities of Coexistence. Washington State University Extension Bulletin. The document was developed in response to the numerous controversial issues surrounding production of brassica vegetable seed crops, brassica oilseed crops, brassica oilseed seed crops, brassica cover crops, etc. in proximity given the risks of cross-pollination, introduction of seedborne, quarantine pathogens into some areas that are highly conducive to these pathogens, the prevalence of GMO traits in some brassica crops like canola vs. the zero-tolerance for GMO traits by many of the markets that buy brassica vegetable seed from the PNW, etc.

  • Brown Marmorated Stink Bug (BMSB). Oregon State University Department of Horticulture. Information on BMSB which is widespread in the Willamette Valley, and its possible damage to crops including vegetables.

Attention Growers

Professor Erik Lichtenberg at the University of Maryland, College Park, is conducting a nationwide survey of vegetable and fruit growers to better understand how the FDAs proposed rule on produce safety under the Food Safety Modernization Act will impact them. The goal of the survey is to identify the current prevalence and cost burden of the kinds of food safety risk-reduction measures specified by the rule in order to determine how the rule will affect different types of growers.

The survey is intended for farm owners and managers growing vegetables or fruit. It takes about 10 minutes to complete on-line. All of the questions in the survey are optional. No identifying information about participants or farms is collected. The "password" provided is only a tool used to direct collected survey data to particular data collection teams.

As an incentive to take the survey, participants have the opportunity to enter a drawing for a free Apple iPad after completing the survey.

This research is very policy-relevant and could help guide future food safety legislation, so all vegetable and fruit growers are encouraged to participate.


If you have any questions, feel free to contact:

Erik Lichtenberg, Professor
Department of Agricultural and Resource Economics
2200 Symons Hall
University of Maryland
College Park, MD 20742-5535
Phone: 301-405-1279
Fax: 301-314-9091
Web page:

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