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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.

Nixing nostoc

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Researchers ‘go to the mats’ to test various control products By Marcelo L Moretti and David King Nostoc are cyanobacteria colonies that can grow where abundant moisture is available. These bacteria form continuous colonies that resemble mats covering gravel, plastic, concrete, or flat surfaces. Nostoc grow during the spring and summer and create a slippery […]

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 […]

The cold shoulder season

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Nursery growers effectively use cold storage to support sales of deciduous trees Plants in the Pacific Northwest experience a wide range of temperatures, from hot, dry summers to cold, wet winters. Deciduous plants grow when conditions are favorable. They enter dormancy when environmental conditions are too cold, dark, or otherwise unsuitable for growth. Deciduous trees, […]

The battle with Bambi

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Growers have several tools available to defend against plant damage from deer and elk Oregon’s deer and elk are prized by hunters and non-hunters alike, and thus represent an income-generating game and wildlife-viewing species for many communities across the state. But for many nursery operators, these majestic animals are a serious detriment. Deer, elk, and […]

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 […]