What kind of beetles live in Colorado pine trees?
Mountain pine beetles ( Dendroctonus ponderosae; MPB) are native Colorado bark beetles that predominately infest ponderosa pine ( Pinus ponderosa ), lodgepole pine ( P. contorta ), and limber pine ( P. flexilis ).
Why are the needles falling off my Colorado blue spruce?
We have long been familiar with Rhizosphaera needle cast, a very common fungal disease that affects primarily Colorado blue spruce, and occasionally Black Hills spruce. This disease causes needles to turn purplish-brown and fall off, working from the inside of the tree out and from the bottom of the tree up.
Are there bark beetles in Rocky Mountain National Park?
Periodic outbreaks of native bark beetles have occurred throughout the history of the park. However, none have been as severe as the recent outbreak. Though bark beetles cause a substantial loss of trees, they are recognized as part of “natural conditions.”
What kind of trees are affected by bark beetles?
However, none have been as severe as the recent outbreak. Though bark beetles cause a substantial loss of trees, they are recognized as part of “natural conditions.” Several species of bark beetles are presently killing lodgepole pine, ponderosa pine, limber pine, Engelmann spruce, subalpine fir and Colorado blue spruce.
What kind of beetles are in Colorado spruces?
The spruce beetle has caused extensive tree damage to all species of spruce throughout the West. Spruce beetles ( Dendroctonus rufipennis) are native bark beetles that infest Engelmann spruce ( Picea engelmannii) and occasionally Colorado blue spruce ( P. pungens) in high elevation forests in Colorado.
How many trees were killed by spruce bark beetles?
(Credit: Robert Andrus) Between 2005 and 2017, a severe outbreak of spruce bark beetles swept through more than 741,000 acres of high-elevation forest in the southern Rocky Mountains near Wolf Creek Pass—killing more than 90 percent of Engelmann spruce trees in many stands.
How many acres are affected by pine beetles in Colorado?
Mountain pine beetle-caused mortality impacted nearly 3.4 million acres compared to 1.78 million acres impacted by spruce beetle statewide over the last 20 years. While mountain pine beetle-caused mortality is currently considered at background levels, spruce beetle-caused mortality continues to remain at outbreak epidemic proportions.
Where to spray for spruce beetle in Colorado?
The Colorado State Forest Service (CSFS) recommends spraying only high-value trees, such as those near homes, businesses or recreation sites. Follow the label of any chosen product.
