White Dust on Leaves? (Powdery Mildew Early Signs)
PM starts as tiny white specks; humidity + low airflow drive it.
Powdery mildew? White dust spots—see causes and analyze fast.
Common Causes
- High humidity/low airflow
- Dense canopy
- Cool nights with condensation
- Infected clones/equipment
How to Tell Which One You Have
Wipe test: white comes off; starts on shaded leaves.
FAQ
Can I wash it off?
Wipe + treat + fix airflow/humidity.
Baking soda spray?
Use approved fungicide; avoid residue on buds.
Remove leaves?
Cull worst leaves and improve airflow.
Browse problem guides
- Brown/Gray Bud Centers? (Bud Rot Early Signs)
- Tiny Flies in Soil? (Fungus Gnats)
- Spider Mites on Cannabis? (Tiny Web Spinners)
- Aphids on Cannabis? (Sap-Sucking Colonies)
- Whiteflies on Cannabis? (Flying Sap Suckers)
- Broad Mites? (Invisible Leaf Twisters)
- Damping Off? (Seedling Stem Rot)
- Spider Mites Webbing Cannabis