Powdery Mildew on Indoor Plants
March 12, 2019
Powdery mildew is a fungal disease with fuzzy white growth. It spreads quickly, covering foliage and blocking photosynthesis, causing leaves to yellow and drop. Zinnia are particularly susceptible to powdery mildew.
Cull the herd if you have a pest or disease outbreak among your indoor plants. Consider removing any heavily infested plants in order to limit the impact on less affected plants.