Mountain Pine Beetles
Western Gall Rust
The Mountain Pine Beetle (MPB) (Dendroctonus ponderosae) is one of the most destructive tree-killing beetles in Oregon. Annual pine mortality from this beetle averaged more than one million acres between 1976 and 1985. Mountian pine beetles attack the bole of the tree leaving random "Pitch Tubes", 1/2 to 1 inch in diameter. Infested trees must be controlled before mid June to ensure the beetles do not emerge and fly on to infest other healthy pine trees.
Western gall rust (Endrocronartium harknessii) is very common on lodgepole and ponderosa pine in Central Oregon. Western gall rust can be identified by the small to large, round to pear-shaped swellings on branches and stems.