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Note: This article is part of the Growing Knowledge series in Digger magazine. This series is provided by Oregon State University in collaboration with the United States Department of Agriculture and in partnership with the Oregon Association of Nurseries.

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 […]

Pollinator plant trials

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Researchers test the value of Willamette Valley natives and nativars Interest in native plant gardening is at an all-time high. For example, native plants were ranked as the top landscape garden trend for 2017–2018 by the American Society of Landscape Architects, and for 2018–2019 by Garden Media Group’s Garden Trends Report. The demand is such […]

Protecting lawns against European chafer

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These control strategies can help mitigate damage to turfgrass The European chafer (Amphimallon majale) is a beetle that feeds on turfgrass roots causing substantial damage. In more recent years, this invasive insect has been confirmed in the Pacific Northwest and British Columbia. Populations have been observed as early as 2015 in Portland, Oregon and Seattle […]

Sense and sensor ability

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NWREC’s Irrigation Classroom evaluates how to best use soil moisture sensors to improve water use efficiency Perhaps it goes without saying, but the millions of trees, vines and shrubs — growing on thousands of acres — require large amounts of water and fertilizer. As a large consumer of water, agriculture has been vilified for assumed […]

Pest management tools for minor crops

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How IR-4 and OSU are working for you With a 2018 farm gate value just shy of $1 billion, it is no secret that the ornamental plant industries in Oregon (nursery and greenhouse) are important and viable enterprises that contribute greatly to the state’s economy. Controlling insect, disease, and weed pests is an important part […]

The smart greenhouse

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By Lloyd Nackley, Chet Udell and Alan Dennis OSU researchers look to repurpose and adapt high-tech trackers and sensors for plant production Greenhouses are critical for nearly all nursery operations. They enable greater control over the growing environment for plants, providing numerous advantages in the face of unpredictable weather and increasing droughts. That’s why many […]

Seeing the light on powdery mildew

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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 […]