In late summer, needles yellow, then turn purple-brown, dropping by late autumn. Damage starts on the inner part of the lower branches, progressing upward and outward so the bottom of the tree is bare and hollow. Branches may die after 3 or 4 years of infection.
Apply a fungicide labeled for this disease, following label directions. Watch for reinfection. Clean up and dispose of fallen needles before spring growth begins. Water in summer and fertilize in the spring to keep trees growing vigorously and prevent needle cast. Avoid wetting needles watering the lawn.