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You are here: Home / Archives for Pests and Diseases

Seeing the light on powdery mildew

By Lloyd Nackley — Posted March 27, 2020

Testing the efficacy of using ultraviolet spectral lights to protect greenhouse tomatoes By Kristine R. Buckland, Cynthia M. Ocamb, Lloyd Nackley and Ann L. Rasmussen Widespread outbreaks of powdery mildew have been occurring in fresh market tomato crops in western Oregon over the past decade. Disease incidence and severity tend to be greater in tomatoes […]

Filed Under: Growing Knowledge Tagged With: Digger, Digger magazine, Growing Knowledge, OSU, Pests and Diseases, powdery mildew

Scouting for boxwood blight

By Jerry Weiland — Posted February 26, 2020

These tips make it easier to spot and mitigate this highly infectious disease By Jerry E. Weiland and Jay W. Pscheidt The 2019 growing season was a big year for boxwood blight in Oregon. The disease, caused by the pathogen Calonectria (Cylindrocladium) pseudonaviculata, has caused substantial damage to boxwood shrubs in U.S. nurseries and gardens […]

Filed Under: Blights, Boxwood Blight, Growing Knowledge, Phytophthora, Plant Diseases, Plant Pests and Diseases, Root Rots Tagged With: boxwood blight, Digger, Digger magazine, Oregon State University, OSU, Pests and Diseases

Sticking together on big pest issues

By Jeff Stone — Posted February 26, 2020

Nursery and greenhouse operators face an ever-increasing set of opportunities and challenges. Few are more daunting, or more of a game changer, than pest and disease issues. Oregon has a stellar reputation of producing quality plant material, which is shipped throughout the Pacific Northwest, the nation and internationally. Faced with uncertainty regarding the spread of […]

Filed Under: Blights, Boxwood Blight, Columns, Director's Desk, Phytophthora, Plant Pests and Diseases Tagged With: Digger, Digger magazine, directors desk, OAN, OAN Members, Pests and Diseases

February 2020

By Bill Goloski — Posted January 29, 2020

Growers are finding new markets with medical facilities as they invest in garden spaces to assist with patient care. Producers are also keeping a tight grip on offering credit to their customers in partners to manage finances. Also in this issue, Todd Nelson shares his background and thoughts on the industry, Mike Darcy predicts a […]

Filed Under: Issues Tagged With: Digger, Digger magazine, Health, Meet the leader, OAN, OAN Members, Pests and Diseases, Trees

Vole control

By Dana Sanchez — Posted January 23, 2020

These tiny, burrowing rodents can cause problems for nursery crops As we anxiously wait for the first breeding-season birds to arrive and signal winter’s end, most vole species are also gearing up to produce more young. Voles are small, native rodents that are often called “meadow mice.” Oregon is home to a total of 13 […]

Filed Under: Growing Knowledge Tagged With: Digger, Digger magazine, Growing Knowledge, Oregon State University, OSU, Pests and Diseases

OSU and USDA Nursery Working Group

By Jay Pscheidt — Posted September 4, 2019

There are many programs at Oregon State University (OSU) and the USDA-ARS- Horticulture Crops Research Laboratory that focus on nursery, greenhouse, landscape and related crops. Here are some of the people and their programs that impact the ornamental industry of Oregon. Neil Bell evaluates landscape plants for drought tolerance and cold hardiness in western Oregon. […]

Filed Under: Blights, Boxwood Blight, Galls, Growing Knowledge, Insects, Phytophthora, Plant Pests and Diseases, Root Rots Tagged With: Digger, Digger magazine, Oregon State University, Pests and Diseases, Research, USDA

USDA releases new emerald ash borer detection map

By Bill Goloski — Posted August 7, 2019

USDA has released an updated version of its emerald ash borer (EAB) map (PDF). It shows the counties in which authorities have detected the destructive, invasive beetle that is responsible for the deaths of tens of millions of ash trees in the United States. The pest was first detected in the United States in Michigan […]

Filed Under: Borers, Emerald Ash Borer, Insects, Nursery News, Plant Pests and Diseases Tagged With: eab, Pests and Diseases, Trees, USDA

Solving irrigation drip tape damage

By Jana Lee — Posted June 24, 2019

Managing the pests that are causing the problems Who has been chewing through our irrigation tape? A grower contacted us after detecting a large number of irrigation leaks of uncertain origin. The grower found holes in the tubes where the leaks had occurred. Many of the holes showed frayed edges and were less than 1 […]

Filed Under: Growing Knowledge Tagged With: Digger, Digger magazine, Irrigation, Oregon State University, Pests and Diseases

Testing the waters

By Jennifer Parke — Posted May 24, 2019

How to test your irrigation system for the presence of Phythophthora By Neelam R. Redekar and Jennifer L. Parke Phytophthora is a fungus-like organism — called a water mold — that can infect a wide variety of nursery plant species. One of the ways it can spread is through irrigation water. Depending on size, a […]

Filed Under: Blights, Cankers, Growing Knowledge, Phytophthora, Plant Pests and Diseases, Pythium Root Rot, Rhizoctonia Root Rot, Root Rots Tagged With: Digger, Digger magazine, Oregon State University, Pests and Diseases, Phytophthora, Plants

Emerging threats to conifer foliage

By Jared LeBoldus — Posted March 27, 2019

Growers and nurseries should be on the lookout for these diseases By Jared LeBoldus, Dave Shaw, and Paul Reeser Two new foliage diseases of Douglas fir and several other conifer species are emerging in Oregon, and they could be a threat to conifer growers and nurseries. The pathogens include Phytophthora pluvialis, the cause of Pytophthora […]

Filed Under: Blights, Growing Knowledge, Needle Casts, Phytophthora, Plant Pests and Diseases, Rhizoctonia Root Rot, Root Rots Tagged With: conifers, Digger, Digger magazine, Growing Knowledge, Oregon State University, Pests and Diseases

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NURSERY NEWS

In Memoriam: Melvin John Steffenson

New USDA Census of Hort arriving in mailboxes this month

Oregon Association of Nurseries honors the industry’s best at 2024 Convention

Eason Horticultural Resources is now employee-owned

Oregon’s nursery licensing program aims to keep the entire industry healthy

Building trust is key to establishing clientele base for new nurseries

Five owners share their experiences on what it takes to start a nursery businesses

Bailey hires new CFO and chief HR officer

More Nursery News

From the pages of Digger

May 2025: Sustainability Issue

April 2025: The Tree Issue

March 2025: The Perennial Issue

February 2025: The Greenhouse Issue

January 2025: The Retail Issue

More issues of Digger

Pests and Diseases

Prioritizing nursery pest challenges

New tools in the battle against thrips

Aiming for precision in pest control

Oregon’s nursery licensing program aims to keep the entire industry healthy

$250,000 shifted to P. austrocedri research

More articles

FARWEST SHOW UPDATES

Sense of excitement prevailed at Farwest as nursery industry ‘Meets the Future’ 

Farwest Show attendees select favorites for the Retailers’ Choice Awards

Starway to Heaven™ Japanese Snowbell wins People’s Choice balloting at Farwest Show New Varieties Showcase

Hopper Bros. wins Best in Show booth award at 2024 Farwest Show   

Starway to Heaven™ Japanese Snowbell wins Judges’ Best in Show at Farwest Show New Varieties Showcase

More Updates from Farwest

The Value of Membership

Meet the leader: Sam Pohlschneider

OAN honors the industry’s best

Oregon Association of Nurseries honors the industry’s best at 2024 Convention

More member stories

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