Many have commonly believed that more diverse habitats are less likely to be invaded by exotic plants since ecological niches are occupied by species already present. Recent evidence shows that invasibility is a much more complex issue and may be …
Preventing Forest Tree Illness
Root diseases usually thin or fade crowns over a period of years. Photo: Chris Schnepf.
Do not wait to act on insect and disease issues until after you see dead branches. Look for visible symptoms or signs of tree illness …
Invasive Species in Forests
Invasive Forest Plants
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A Regional View of Invasive Plants
How does what I do in my yard, on my land and in my garden affect what plants invade our forests and grasslands? What has happened on the land where you live (its history of use), and what you plant …
Oak Decline
Written by D.J. Moorehead and G.K. Douce for Forest Encyclopedia Network
Causal Agents
Oak decline is the name given to a slow-acting disease complex stemming from interactions between biotic and abiotic stressors of oaks (Quercus spp.). Abiotic factors …
Sudden Oak Death in the Eastern United States
Adapted from: D.J. Moorhead and G.K. Douce for Forest Encyclopedia Network
Sudden oak death, caused by the pathogen Phytophthora ramorum, is a potentially devastating disease. P. ramorum has been found in nurseries in California, Oregon, Washington, and British Columbia,
Purple Loosestrife-Lythrum salicaria
Written by D.J. Moorhead and G.K. Douce for Forest Encyclopedia Network
Figure 1. Purple loosestrife is easily recognized in the summer and early fall by its showy spike of purple flowers. Photo by Eric Coombs, Oregon Department of Agriculture, courtesy
Oriental Bittersweet-Celastrus orbiculatus
Written by D.J. Moorhead and G.K. Douce for Forest Encyclopedia Network
Figure 1. Oriental bittersweet’s leaves are elliptical in shade and alternately arranged. The vines can wrap tightly around trees, potentially girdling the tree and killing it. Photo by James
Kudzu-Pueraria montana (Lour.) Merr.
Adapted from: D.J. Moorhead and G.K. Douce for Forest Encyclopedia Network
Figure 1. Distinctive three-parted leaf of kudzu. Photo by James H. Miller, USDA Forestry service, courtesy of forestryimages.org.
Kudzu is a climbing deciduous vine capable of reach lengths of …