I just noticed two leaves that have a large spot growing on them. The spots look more white than brown and it just started developing two days ago. Help Unable to send photo
Outside Plant (Large)
Certified GKH Gardening Expert
A white powdery appearance on leaves is usually caused by powdery mildew fungus:
If the spots later turn brown, it is most likely something else. What it is would depend on what plant it's growing on and the particular appearance of the spots.