by U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station in Ogden, UT .
Written in English
|Statement||Gene D. Amman, Judith E. Pasek|
|Series||Research paper INT -- 367|
|Contributions||Pasek, Judith E, Intermountain Research Station (Ogden, Utah)|
|The Physical Object|
|Pagination||7 p. ;|
Several species of bark beetles are presently killing lodgepole pine, ponderosa pine, limber pine, Engelmann spruce, subalpine fir and Colorado blue spruce. Hard winters with cold temperatures can kill beetle eggs and larvae wintering under a tree's outer bark. Mountain pine beetle typically initi-ates attacks on the lower 15 feet of a tree bole, although the crown of large trees, particularly sugar pine, may be attacked Figure 1. The range of mountain pine beetle generally follows its major host pine species throughout western North America (shown in green). Current range of mountain pine beetleCited by: Mountain pine beetle in ponderosa pine--prospects for silvicultural control in second-growth stands. J. For. Website links. Mountain pine beetle in Southwest Oregon whitebark pine, in The status of whitebark pine along the Pacific Crest National Scenic Trail on the Umpqua National Forest. Mountain pine beetle galleries formed underneath the bark of a ponderosa pine. A key stage in the life cycle occurs when the beetle transmits a blue stain fungus to the tree. Attacking adult beetles carry fungal spores within a specialized sac (mycangium) on the maxillary cardine (mouthparts).
mountain pine beetle outbreaks. At endemic levels, beetles will selectively attack stressed or weakened trees but during outbreaks, healthy trees and less preferred pine hosts may also be attacked. Hosts Major: lodgepole, ponderosa, western white, sugar and white bark pine MPB adult caught in a sap flow (pitch tubes are signs of beetle attacks) g. The current outbreak in the Rocky Mountain National Park began in and has caused the destruction of millions of acres of ponderosa and lodgepole pine trees. According to an annual assessment by the state’s forest service, , acres of trees in Colorado were infested by the mountain pine beetle at the beginning of The red turpentine beetle causes larger pitch tubes than the mountain pine beetle and like i said only attacks the base of the tree. If these pitch tubes are up farther on the bole, i.e. 20 to 30 ft or more, then this is the mountain pine beetle and if the entire circumference of the bole is affected there is a good chance the tree is dead. Hosts: Ponderosa pine, white pines Figure Adult mountain pine beetle. Symptoms/Signs: External evidence on green infested trees consists of pitch tubes. On successfully attacked trees, these are small and numerous. Pitch tubes on unsuccessfully attacked trees are larger in size (around 2 cm in diameter), typically white, and widely scattered over the trunk.
Introduction. The mountain pine beetle (Dendroctonus ponderosae; MPB) is an eruptive bark beetle that infests different pine (Pinus sp.) species in its native range of western North the late ’s, a continuous MPB outbreak has affected over 25 million hectares of lodgepole pine (Pinus contorta) forests MPB has crossed the geographic barrier of the Rocky . The tiny mountain pine beetle, which is just a quarter of an inch long, has destroyed nea square miles of forest in the Rocky Mountains. University of Montana ecologist Steve Running says warmer temperatures in the Rockies bring spring earlier and fall later, each by about a week, yet precipitation has remained about the same. The mountain pine beetle begins attacking most pine species on the lower 15 feet of the trunk. They need adequate food, found in large-diameter trees, for their population to build up. After the larger lodgepole pines are killed, beetles infest smaller and smaller trees, where phloem is thin and excessive drying occurs. Get this from a library! Mountain pine beetle in ponderosa pine: effects of phloem thickness and egg gallery density. [Gene D Amman; Judith E Pasek; United States. Department of Agriculture.; Intermountain Research Station (Ogden, Utah)].