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
We had a new extension bulletin published in May. Follow the link to read it.
Pacific Northwest Extension publications are produced cooperatively by the three Pacific Northwest land-grant universities: Washington State University, Oregon State University, and the University of Idaho. Similar crops, climate, and topography create a natural geographic unit that crosses state lines. Since 1949, the PNW program has published more than 650 titles, preventing duplication of effort, broadening the availability of faculty specialists, and substantially reducing costs for the participating states.
Small-Scale Cost-Effective Hot Water Seed Treatment
By Frank Morton (Wild Garden Seed), Tom Stearns (High Mowing Seeds), Nick Andrews (OSU Small Farms Extension)
Hot water seed treatment is an important way of reducing the risk of seed-borne diseases, especially for organic Brassica growers (seed, fresh market or processed market) now that Pacific Northwest growers are dealing with black leg and potential light leaf spot epidemics. Hot water treatment can improve our defense against diseases like blackleg, light leaf spot, Verticillium, Fusarium, Xanthomonas, Alternaria, Botrytis and many seed-bourne viruses.
The authors have put together some slides with some practical ideas for
low-cost and efficient hot water treatment.
Download the Hot Water Treatment Slideshow.
WSU Potato Pest Alert Survey
During each growing season, this website links to current issues of the WSU Potato Pest Alert, published periodically by Washington State University Extension with funds provided by a grant from the Washington State Potato Commission (see below).
WSU Extension is conducting a survey to gather feedback about the WSU Potato Pest Alerts. To participate in the survey, please go HERE.
Vegetable Crop Management 101 Workshop
(In English and Spanish). Proceedings from the Pacific Northwest Vegetable Association pre-conference 'Vegetable Crop Management 101’ Workshop, Nov. 17, 2015, Kennewick, WA.
- Washington State weed or plant identification requests can be made through the Washington State University Crop and Soil Sciences Weed Identification website. Weed specimens may be submitted as digital images or as physical specimens, at no charge, by following instructions on this site.
- 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...
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.
The Oregon State University Department of Horticulture has information on the Brown armorated Stink Bug which is widespread in the Willamette Valley, and its possible damage to crops including vegetables.
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 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
For the details, go here: WANTED DEAD OR ALIVE: Stink Bugs Still At Large in Washington State.
Update 11/12/2014: Invading stink bug eats
Update 10/22/2015: New ‘Alien’ wasp discovered in Washington state - Parasitizes and Kills BMSB. See More...
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 2016-05: This is the 5th potato pest alert issued for the 2016 growing season. Follow the link to read the entire alert. Excerpt:
LATE BLIGHT: Dr. Dennis Johnson's late blight hotline was updated on June 1, 2016. Here is what he says...
Late blight has just been confirmed in a Russet Norkotah field near Burbank in Walla Walla County. This is the earliest we have had late blight in the Columbia Basin and there is an association between earliness and the number of fields infected and damage. Earlier detection generally correlates with increased disease incidence and severity. The field is well past row closure. Sprinkler irrigated fields in the Burbank, Finley, and north Pasco areas should be treated with a late blight fungicide on a 7 day schedule. Al fields in the Columbia Basin, including rill irrigated fields, should be treated with a fungicide before and within 7 days of any major rainfall. Monitor fields for late blight and watch the weather forecasts for rain. Volunteer potatoes, especially in fields where late blight was present last year, need to be managed.
Please contact Dennis Johnson at 509-335-3753 or email@example.com to report, confirm, or make a late blight diagnosis. The hotline number is 1-800-984-7400
This image shows symptoms of late blight on a newly sprouted plant from an infected seed piece. Photo Source: D.A. Inglis and J. Gigot.
POTATO PSYLLIDS: Potato psyllids were found on sticky cards in 100% of our insect sampling network fields this week (19 of 19 fields that still have traps up). The average catch rate of 7.1 psyllids per sticky card was similar to last week. This is 10 times greater than the average number of psyllids per card this time last year. A lot of psyllids are moving around right now, but that is not surprising since many potatoes are being vine killed or harvested now and psyllids are being displaced. If your potato field has any vine left, then it is very likely that psyllids are moving in now. Some of those psyllids could be carrying the bacterium (Lso) that causes zebra chip.
- V International Symposium on Tomato Diseases: Perspectives and Future Directions in Tomato Protection, June 13-16, 2016, Málaga, Spain.
- Potato Virus Detection Training, June 20, Othello, WA.
- Organic Seed Production, eOrganic Webinar Series - Part 1: Introduction to the Organic Seed Webinar Series, June 21, 12:15 PM PDT
- WSU Commercial Potato Seed Lot Evaluation, June 21, Othello, WA.
- OSU Potato Field Day, June 22, Hermiston, Oregon.
- WSU Potato Field Day, June 23, Othello, WA
- Pacific Northwest IPM Train the Trainer Working Group 2016 IPM Workshop, June 27-29, Aberdeen, ID
- Small Farm Irrigation — Riego para Granjas Pequenas, June 29, Mount Vernon, WA
- Organic Seed Production, eOrganic Webinar Series - Part 2: Trials and Selection, July 19, 12:15 PM PDT
- Weed Management — Manejo de Malezas, July 27, Mount Vernon, WA
- Pest Management — Manejo de Plagas, Aug. 10, Mount Vernon, WA
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