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You are here: Home / Archives for Plant Pests and Diseases / Plant Diseases / Phytophthora

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

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

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

Heroes and villains

By Jerry Weiland — Posted February 27, 2018

Research identifies harmful and beneficial microbes in nursery soil Four years ago, we received funding from the Floriculture and Nursery Research Initiative to study the interaction of soil-borne pathogens and environment on nursery plant health and disease control (Digger, July 2015). Since then, we have made significant progress in identifying the beneficial and pathogenic microbes […]

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

The sudden oak death epidemic in Oregon

By Sarah Navarro — Posted September 13, 2017

Oregon nurseries are increasingly threatened by the repeated expansion of the sudden oak death (SOD) epidemic in Curry County. Although this epidemic is geographically far away from the main nursery production areas, the continued expansion of the SOD quarantine area and the newly discovered introduced EU1 clone are distinct threats to the nursery industry. What […]

Filed Under: Growing Knowledge, Phytophthora, Plant Pests and Diseases Tagged With: Invasive species, ODA, Oregon Department of Agriculture, Oregon State University, Pesticides, Pests and Diseases, USDA, Wholesale Nurseries

Slow sand filters

By Peter Szymczak — Posted April 3, 2017

This traditional method of water purification was tested for its effectiveness at removing two common greenhouse pathogens, Phytophthora and Fusarium.

Filed Under: Fusarium Root Rot, Growing Knowledge, Phytophthora, Plant Diseases, Plant Pests and Diseases, Root Rots Tagged With: Digger, Digger magazine, Irrigation, Oregon State University, Science

Researchers look at thermal weed control

By Peter Szymczak — Posted March 15, 2017

Researchers look to control weeds in greenhouse propagation systems with steam and hot water

Filed Under: Nursery News, Phytophthora, Plant Pests and Diseases, Weeds Tagged With: Greenhouses, Operations, Pests and Diseases, Plants, Research, Science

Working smarter, not harder

By Luisa Santamaria — Posted February 1, 2017

OSU Extension Service offers programs designed to increase knowledge among nursery workers, thereby increasing their productivity.

Filed Under: Blights, Boxwood Blight, Growing Knowledge, Phytophthora, Plant Diseases, Plant Pests and Diseases Tagged With: Digger, Digger magazine, Education

Soilborne diseases of nursery crops

By Jerry Weiland — Posted July 1, 2015

USDA-ARS and OSU team up to tackle this pernicious problem

Filed Under: Growing Knowledge, Phytophthora, Plant Pests and Diseases, Pythium Root Rot, Root Rots, Verticillium Root Rot Tagged With: Digger, Digger magazine, 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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