Swiss needle cast

This fungal disease causes infected needles to become off color and mottled yellow or brown. The needles may turn completely brown and are usually dropped prematurely, often in early spring.

Start with sanitation: remove and dispose of affected material as you find it. Thin dense growth to improve air circulation, and redirect irrigation away from foliage. If the condition persists despite cultural adjustments, your local Extension office can help identify the pathogen and recommend targeted treatments.