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
- 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.
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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.
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.
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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.
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Potato Pest Alert 2015-17: This is the 17th potato pest alert issued for the 2015 growing season.
POTATO PSYLLIDS: There were potato psyllids on sticky cards in 88% of our insect sampling network fields this week. The average number of potato psyllids on the sticky cards was 3.0, which is up from 1.7 psyllids per card last week. We have four sticky cards in each of the fields, and the number presented is the average of four cards. The most potato psyllids on a sticky card this week was 31 in a field near the WA/OR border (the total on four cards in this field was 80 psyllids). The highest count we've seen on a card so far this season was 140 in a field near Pasco (the total on four cards in this field was 211). The pest density maps below help you to see how the psyllid collections varied across the region and how they have changed from last week. The largest collections have been on sticky cards in the Lower Columbia Basin, but over the past few weeks we have seen the numbers increase in the Upper Columbia Basin. Maps available in the full alert illustrate this.
ZEBRA CHIP INCIDENCE: There have been two fields with confirmed zebra chip in Washington this season. The first was in Franklin County and was detected in June, and the second is in Walla Walla County and was detected in July. The first of these fields has been harvested. We did not see any evidence that zebra chip had spread beyond the original infected area when we revisited the Franklin Co. field in late July. I suspect that there are other fields in the Columbia Basin with some zebra chip. Growers should monitor fields frequently for foliar symptoms of zebra chip. If you see symptomatic plants, then dig them up and cut the tubers to see if they are also showing tuber symptoms. Also, if you have green vines in most of the field, but notice an area with dead vines, you might want to check tubers in the dead zone for zebra chip symptoms as it is possible to miss the early foliar symptoms. Please contact Carrie Wohleb at 509-754-2011 x.4313 or Tim Waters at 509-545-3511 to report, confirm, or make a zebra chip diagnosis.
- WSU Carrot Field Day, August 13, Pasco, WA.
- Onion Variety Day, August 25, Ontario, OR.
- The XVII International Plant Protection Congress, August 24 - 27, Berlin, Germany.
- WSU Onion Field Day, Auguat 27, Quincy, WA.
- Durable Resistance against Phytophthora by cisgenic modification, Sept. 3, Wageningen, The Netherlands.
- Vegetable Variety Field Day, Sept. 17, Aurora, OR.
- IR-4 Global Food Use Workshop, Sept. 22 - 23, Chicago, IL.
- IR-4 Global BioPesticide Workshop, Sept. 24, Chicago, IL.
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