The Catalpa powdery mildew Erysiphe elevata in Slovakia

The first record of Erysiphe elevata (Burrill) U. Braun & S. Takamatsu (syn. Microsphaera elevata Burrill), North American powdery mildew in Slovakia is presented. It was found on living leaves and fruits of southern catalpa (Catalpa bignonioides Walt.). The fungus is described and photographically documented.