Common Tree Insects and Diseases

Emerald Ash Borer

Emerald ash borer is an invasive insect that originaly came from Asia and was first discovered in Michigan and Windsor Ontario. This insect is green in color and are around 1/4″-1/3″ in size.

Spider Mites

These extremely small pests can cause extreme damage to lawns, shrubs and trees. Typically hot dry conditions and a mild winter can cause spider mites to flourish and spike in population.

IPS Beetles

IPS are a type of bark beetle that attack several species of trees including spruce, ponderosa, lodgepole and limber pine. There are 11 species of IPS beetle found in Colorado.

Dendroctonus Beetles

There are 12 types of Dendroctonus beetles found in the west. Dendroctonus means tree killer, these types of bark beetles are the most destructive to trees and include spruce beetle, western bark beetle, mountain pine beetle, and douglas fir beetle.

Pine Needle Scale

These insects can be found on the needles of infested trees and appear as small white specks on the needles