Phomopsis Tip Blight

Phomopsis tip blight is one of the most common fungal disease of conifers, including junipers, arborvitae, firs, larch and jack pine. This factsheet describes symptoms and management of this tip blight.

Pine Root Collar Weevil

Pine root colar weevil is a destructive pest of pines, including Austrian, Scots, red and Eastern white. Learn synptoms and how to protect your trees in this factsheet.

Cytospora Canker

Cytospora canker is one of themost common fungal diseases of Colorado blue spruce, and can also affect other spruce and firs. Learn about symptoms and management in this factsheet.

Diplodia Shoot Blight and Canker

Diplodia shoot blight and canker is one of the most common fungal diseases of Austrian pine in Wisconsin, and can also affect other pines as well as other conifers including cedars, cypresses, firs, junipers and spruces. Learn more here.

Ips Bark Beetle

Ips bark beetle, also known as the pine engraver, is an insect that attacks and kills weak, stressed, declining and dying pine and spruce trees. Identification and management are covered in this fact sheet.

Dothistroma Needle Blight

A common needle blight, Dothistroma can affect over 30 species of pine trees, especially Austrian pine. Learn symptoms and management of this disease in this facthsheet.

Swiss Needle Cast

Swiss needle cast is a fungal disease of Douglas fir. Symptoms and management of this disease are described in this factsheet.

Weir’s Cushion Rust of Spruces

Weir’s cushion rust is a needle disease that disfigures and reduces growth of spruce trees. Learn to identify and avoid problems with Weir’s cushion rust in this factsheet.

Phytophthora Root Rot of Christmas Trees

Phytophthora root rot is a common disease of Christmas trees including Douglas-fir, balsam and true firs (e.g., Fraser, balsam and Canaan), spruces, and pines. This fact sheet covers symptoms and management.

Western Conifer Seed Bug

A large and somewhat strange-looking insect, Western conifer seed bugs are less of a plant pest than they are a nusiance when they overwinter inside homes. Learn more in this factsheet.

Gymnosporangium Rusts

Gymnosporangium rusts, such as Cedar Apple Rust, need both junipers and woody plants in the rose family to complete their life cycle. Learn more in this factsheet.

Support Extension