Annual cold snaps have kept some invasive tree pests in check, but outbreaks could become more common with warming ...

The amount of forest with problems is only a small fraction of the overall 22 million acres state officials looked at, but it ...

Dave Powell/USDA Forest Service (retired) / Bugwood.org. All spruce trees have sharp-pointed needles that are often 4-sided or diamond-shaped in cross-section and have four whitish striped lines.

Example of conifer trees include pine, fir, spruce and cedar. Some shrubs which are conifers include juniper, arborvitae and others. Garden: Flowering plants that thrive in full sun and high heat.

Example of conifer trees include pine, fir, spruce and cedar. Some shrubs which are conifers include juniper, arborvitae and ...

Parts of the North Cascades and Mount Baker are facing an outbreak of the western spruce budworm, aerial surveys reveal. The ...

Now, researchers at the University of Texas at Arlington are using artificial intelligence to take the guesswork out of pollen tracking, starting with tree pollen.

It stripped the needles from fir and spruce trees across most of northern Maine, killing 7 million acres of trees and costing the state’s forest economy hundreds of millions of dollars.

Surveyors mapped approximately 545,000 acres across Washington with some level of tree mortality, tree defoliation, or foliar ...

Loveland’s tree streets include 22 streets named for trees in the Pine Family. The family includes 234 species worldwide and they separate into nine groups: cedars, Douglas-firs, firs, golden ...

The eastern spruce budworm is a native insect that munches on balsam fir, leaving some 1,100 square miles of trees defoliated or dead last year, the most in the region since 1961.

Reviewing the wild world of evergreens can help gardeners and homeowners care for and maintain their landscapes.