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Oregon Quarantines The following diseases are quarantined against shipment into and within Oregon. Oregon also has several control areas designed to protect specific counties or designated areas from diseases and pests of regulatory concern that may exist ...
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Oregon’s Most Unwanted: Invasive Species Invasive species are those plants, animals, and microbes not native to a region which, when introduced either accidentally or intentionally, out-compete native species for available resources, reproduce prolificall ...
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Tree Wound Paints Paints have been used over the years to try to protect tree wounds from invasion by microorganisms and to promote healing. With a few exceptions, paints are not widely recommended for this use. Trees already have natural methods of heali ...
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Copper-based Bactericides and Fungicides Jay W. Pscheidt, Extension Plant Pathology Specialist, OSU Copper pesticides are a group of many different compounds that have some form of copper in common as the active ingredient. These compounds have protectant ...
Plant Viruses: Dead or Alive? Jay W. Pscheidt, Extension Plant Pathology Specialist, OSU At this writing, most of us are in the midst of stay at-home orders due to the SARS-CoV-2 virus pandemic. The world at large is learning more than they wanted to abou ...
Recognizing Sapsucker Damage on your Trees Kevin W. Zobrist, WSU Extension Forestry Educator A common cause of tree damage in backyards and small woodlands is from sapsuckers (Sphyrapicus spp.), which are a species of woodpecker. The Pacific Northwest has ...
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Disease Diagnosis and Management Someone who has a plant problem asks two questions: What is the problem, and how do I correct it? These are hard questions for beginners and experts alike. Diagnosis is the process of determining the cause of a problem. It ...
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Lawn and Turf-Nematode, Root-knot See: Wheat (Triticum aestivum)-Nematode, Root-knot ...
Acervulus (pl. Acervuli) A cushion-like, spore-producing body of a fungus erupting from host tissue usually below the cuticle or epidermis. ...
Actinomycetes Filamentous bacteria that produce several antibiotics and give soil its earthy smell. ...