Pests & Insects
Aspens Turning Orange? It’s Cytospora Canker
Cytospora canker causes dead or dying areas on tree bark. In aspens, this area turns orange. The cankers kill tree branches (you’ll often see this in spruce) and, in severe cases, will kill the whole tree. There’s no cure so prevention is critical.
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Scale Insects: Oystershell, Pine Needle & Striped Pine Scale
Scale insects can be extremely damaging to trees and shrubs in the Evergreen, CO region, causing leaf/needle discoloration, defoliation, stunted growth, limb dieback, vulnerability to other pests and diseases, and even plant death. Here’s how to identify scale insects, as well as treatment options and timing.
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Aphids Cause Sticky Leaves & Black Patches
Aphids are small insects that suck the sap from plant leaves, twigs and stems. They excrete a sticky substance called honeydew (often mistaken for sap “bleeding” from the tree) that can develop sooty mold (a black coating on leaves and surfaces). Treatment and prevention are possible. Read more for the details.
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Ips Beetle – A Killer of Pine and Spruce Trees
Ips beetles are a frequent problem in Colorado, including here in the Denver foothills where they can kill whole forests in a single season. They’re especially problematic during periods of prolonged drought.
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Dwarf Mistletoe – The Facts
This common parasitic plant makes its home on pine trees. It’s a weed! We can prune it out of your trees or spray to keep it from spreading. Every situation is different, so let a Certified Arborist help you mitigate Dwarf Mistletoe problems.
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Cooley Spruce Gall Adelgid
Cooley spruce galls are common in Colorado and are often seen on blue spruce. The galls are caused by the Cooley spruce gall adelgid (or wooly aphid). But while they may look alarming, Cooley spruce galls usually do little or no damage to the tree.
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