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 […]
Scouting for boxwood blight
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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 […]
Sticking together on big pest issues
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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 […]
February 2020
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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 […]
Vole control
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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 […]
OSU and USDA Nursery Working Group
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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. […]
USDA releases new emerald ash borer detection map
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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 […]
Solving irrigation drip tape damage
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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 […]
Testing the waters
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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 […]
Emerging threats to conifer foliage
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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 […]
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