Identifying and Managing Common Tree Diseases in Idaho

Tree diseases are a common problem in Idaho. They can deform trees, stunt growth, and lead to tree death.

In 1981, heavy infection of ponderosa pine by red band needle blight was observed on the Nez Perce and Clearwater National Forests (figure 5). Discolored interior needles were also noted in south-central Idaho near Garden Valley.

Bark Beetle Infestations

In recent years, bark beetles in several species have wreaked havoc on forests throughout Idaho’s Sawtooth, Salmon-Challis, Caribou and Targhee national forests. The beetles, which are tiny, swoop in and take advantage of stressed …