![]() Type of Sample Needed for Diagnosis and Confirmation However, symptoms typically first appear in early fall, although they may not be noticed immediately. The fungus is active throughout the growing season and can infect any age of needle during wet weather. An entire tree may progressively lose its needles, decline, and die over the course of a few years.ĭothistroma needle blight is caused by the fungus Dothistroma pini (also called Mycosphaerella pini). Typically, the most severely affected branches are towards the bottom of the tree. Diseased needles may drop prematurely, several months after they are infected. The needle tips beyond the bands dry out and turn brown a couple weeks after the bands appear, while the bases remain green. Affected needles have reddish brown spots or bands. Symptoms of Dothistroma needle blightĭothistroma needle blight is a common fungal disease that causes browning of needles of Austrian, ponderosa, and mugo pines. Fungicide sprays may be used if symptoms are found and are applied in the spring.ĭothistroma needle blight is especially common on Austrian pines.Dothistroma needle blight can be prevented by keeping trees in good vigor through watering and mulching, and promoting air circulation through appropriate pruning, adequate spacing, and weeding. ![]()
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