White Powdery Mildew

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White Powdery Mildew

White Powdery Mildew

This Fungus is a nightmare, but a fixable one at that!

White powdery mildew is a fungus that can grow on a wide array of plants, and can be an especially annoying problem for a budding marijuana grower. This problem is relatively easy to fix, just make sure you catch it early! You do not want this disease to ruin an entire grow.

This disease is pretty easy to identify as you can see in our video. It looks like a white powdery dust that accumulates on the plants leaves. The main problem with this disease is how easy it is to spread,when dealing with this issue you need to take extra care to ensure you do not transfer the spores from one plant to the next. Once the spores gets onto another plant they quickly spread, worsening the problem. You can see in our video the extent this disease can get to if unchecked. Once the disease reaches this level on your plant it will heavily affect the plant’s growth, reducing the rate of photosynthesis and reducing its eventual yield.

A close up of mildew of a leaf

How does White powdery Mildew form?

Humidity: Moisture is a big cause of this fungus, but unfortunately it does not need much. A high-humidity in your grow room can create the perfect conditions for the growth and spread of white powdery mildew. Reducing the humidity in your grow room can prevent the growth of mildew.

Bad ventilation: To prevent the growth of white powdery mildew you need to ensure there is a constant flow of fresh air into your grow room and movement of this air in said grow room. The fresh air means that if spore come into your grow space they will be quickly be recycled out. A fan in the room will blow the spores off the leaves, preventing growth.

Dense foliage or flower: If your plant is too dense it will cause leaves and buds to rub against one another creating spaces that will trap moisture, creating an ideal environment for the growth of mildew. Proper trimming and defoliation of your plant will prevent this issue.

So we have dealt with what powdery mildew is and how to prevent it. Stay tuned on our website to get a run down of methods of dealing with this issue once it has affected your plants.

Part 1 of Marijuana SA’s series on White Powdery Mildew


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