Best Ways to Kill Powdery Mildew on Cannabis Plants 🌱🦠Updated 2 hours ago

Powdery mildew is one of the most common problems growers face. It appears as white, powdery spots on leaves and can quickly spread if not controlled. Luckily, there are safe and effective ways to stop it.

Step 1: Remove Infected Leaves ✂️

• Carefully cut away heavily affected leaves.

• Dispose of them away from your grow area to prevent spores from spreading.

Step 2: Improve Your Environment 🌡️💨

• Airflow: Use fans to keep air moving around plants.

• Humidity: Keep RH under 50% during flower.

• Spacing: Don’t let plants crowd together — airflow is key.

Step 3: Apply Treatments Safely 🌿💧

Several natural options can kill and control powdery mildew:

• Potassium Bicarbonate Spray: Kills mildew spores on contact.

• Neem Oil (Veg Only): Works well but should not be used in flower due to residue.

• Diluted Hydrogen Peroxide Spray: A quick way to sanitize leaves.

• Milk Spray (10:1 water to milk ratio): Creates an environment powdery mildew can’t survive in.

Step 4: Ongoing Prevention 🛡️

• Clean your grow area regularly.

• Use oscillating fans to keep air fresh.

• Check plants daily so you can catch outbreaks early.