Abstract
In Korea, powdery mildew has been observed on
Figures & Tables
Fig. 1. causing powdery mildew on Quercus rubra. A: Affected tree showing powdery mildew symptoms. B: Close-up of affected leaves. C: Fallen leaves with powdery mildew symptoms. D: Appressoria on a hypha. E-G: Conidiophores. Arrows indicate septa. H-J: Primary conidia. K-P: Conidia. Q-R: Germinating conidia.