Fine roots decay, and cankers may develop at the base of the stem. Phytophthora-specific fungicides are available. Generally, their use is not recommended for established plantings. Remove and destroy affected plants. If practical, improve soil drainage and replant with a more tolerant variety.
Evergreen leaves turn brown at edges and near tips.
There may be large, brown blotches as well. More prevalent on older leaves. Be sure soil is moist in the fall. Damaged plants should be fertilized. Provide wind breaks around plants.