Overview of Dothistroma needle blight
Dothistroma needle blight is especially common on Austrian pines.
Signs and symptoms of Dothistroma needle blight
Affected needles develop brown bands, and the portion of the needle beyond the band dies. Trees are often affected from the bottom of the canopy working up.
See this article about Dothistroma needle blight.
Type of Sample Needed for Diagnosis and Confirmation
The Iowa State University Plant & Insect Diagnostic Clinic can help you to investigate and confirm if you plant has this disease. Please see our website for current forms, fees, and instructions on collecting and packing samples. Contact information for each states diagnostic laboratory for U.S. residents. If your sample is from outside of Iowa please do not submit it to the Plant & Insect Diagnostic Clinic without contacting us