Despite some pest issues, birch trees provide a distinctive, well-loved look Sales of popular birch trees in Oregon plummeted in the early 2000s when the bronze birch borer made its way across the country and began attacking susceptible plants up and down the Willamette Valley. The voracious insect had been plaguing states in the Midwest […]
Lessons from an ice storm
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Widespread tree destruction highlights the importance of proper selection and maintenance The northern Willamette Valley in Oregon was hit by a once-in-a-generation ice storm on February 12 and 13 of this year. In the small town of Silverton, where the valley meets the Cascade Range foothills, freezing rain fell for more than 30 hours. Trees […]
The grassroots of research
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The nursery industry plays an important role funding and vetting beneficial research projects Universities and colleges, in Oregon and elsewhere, don’t merely provide nurseries and greenhouses with well-trained, knowledgeable and conversant employees. They also provide research-proven knowledge and best practices, so growers can produce a better crop and run a more profitable business. These institutions […]
Villains of the greenhouse
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When seedlings fail, Rhizoctonia damping-off, root and stem rot may be the cause There is so much hope for the future when we plant seeds, but that can be dashed when they don’t emerge, or when they fall over soon after popping out of the media. There are many fungi that live and survive in […]
Knowing your cedar pests
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Grower awareness of problems can protect both grower and customer It’s important to be aware of issues in the landscape and forest, as they can become problems in the nursery or for your customers. Cedar trees have a number of pest and problems to be aware of, from abiotic disorders to insects and diseases. Some […]
Silicon: the non-essential beneficial nutrient for plant defense?
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Rhododendrons and azaleas are the backbone of many ornamental landscapes in the Pacific Northwest. Unfortunately, since 2016, a beautiful little insect has been plaguing the genus Rhododendron, causing aesthetic and physiological damage, which may lead to plant death if left unchecked (Figure 1). Preliminary studies suggest that cultivars vary in their tolerance to azalea lace […]
Managing epidemics
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Whether dealing with plant pathogens or COVID-19, common principles apply The COVID-19 pandemic has changed life as we know it, threatening human health, causing disruption to our society, and resulting in economic challenges. While impacts of plant pests and diseases may pale in importance compared to COVID-19, they still cause large-scale ecological and economic damage […]
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 […]
Fire blight in the plant nursery
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How did it arrive here, and what can be done? Fire blight is a disease that can kill apple and pear trees. It is especially dangerous in a nursery setting, for reasons we will explain. The disease can result in the direct loss of plant material, which in turn can necessitate a costly and difficult […]
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