Pine-Oak Gall Rust (Eastern Gall Rust) Of Oak

Disease Information

Pine-Oak Gall Rust (Eastern Gall Rust)

 Symptoms and damage

The fungus Cronartiumquercuum causes gall rust on approximately 25 to 30 species of pine and oak. Infection of oak causes small brown or yellowing areas on the leaves. On the underside of the leaves, yellow to orange powder (spores) is visible.


 All fungal spores, which infect both pine and oak, are primarily windborne. High humidity increases the incidence of infection. Chemical control is usually not warranted. The fungicide myclobutanil may be applied to oaks according to the directions on the label. Follow the directions on the label..


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