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White Powdery Mildew

White Powdery Mildew on Cannabis Plants: How to Cure & Prevent!


White Powdery Mildew on Cannabis Plants: How to Cure & Prevent!

Cure & Prevent WPM growing on your Cannabis Plants!

What’s up Cannabis Growers! My name is Dylan and welcome back for another episode of GreenBox Grown. Today I will be explaining how you prevent and cure White Powdery Mildew in your Cannabis Grow Room, so lets get started.

Alright so White Powdery Mildew, or WPM for short, can cause serious damage to your plants, so it is important to take care of this issue right when you first discover it. WPM is very easy to remedy but if you don’t take care of it early on it will have catastrophic results on your crops and bud. You can see on these leaves there are white fuzzy spores almost like powder that has been sprinkled on top. This is the WPM in its early stages, and needs to be taken care of quickly before it spreads.

Now before I show you have to eradicate the WPM, I want to explain how to prevent it. White powdery mildew is not like a pest where it invades your grow room and then you have to take care of it by killing it off. Instead, WPM is caused by certain conditions being consistently present in your greenhouse or grow room. The first and most common cause of mildew on your cannabis plants is from consistently overwatering them.

After awhile of the roots being soaked in water, they develop a fungus which surfaces as white spores on your fan leaves. To prevent WPM and the conditions it thrives in, follow these simple steps. Make sure there is plenty of air circulation in your grow room and there is no still or stagnant air. This is done with oscillating fans. Next make sure your temperature and humidity are at the right levels for the stage you are in with your grow. Too much humidity and heat can easily lead to mold and other funguses growing on your plant. Finally make sure to open up you vents frequently so fresh air can flow in and the old air out.

Here are some more closeups of the WPM taking over the fan leaves and even spreading to some of the bud sites. While the white powdery mildew does not do much damage being on fan leaves, it does harm buds and their growth. Eventually the WPM will spread to the main buds and colas, and will rot them from the inside out. What you are left with is a moldy bud that must be cut down and thrown away, as it is unsmokable. Once you have reached that stage, most growers call it quits as it is nearly impossible to stop the mildew from ruining the rest of the buds in your grow room. This is why it is so important to take care of this issue as early on as possible.

WPM can also spread from plant to plant really easily. Luckily there is a spray made form all natural ingredients called the doctor earth disease and Fungicide control and you can spray it on the mildew to make it go away. You want to get a good coverage of spray all across the tops and bottoms of your fan leaves, while avoiding getting any mist on the buds. If you are in veg, then there is no need to worry about that. Spray a little extra on the fan leaves with white spores on them so you can really take care of the issue and prevent it from coming back. You will see the WPM dissolve and go away as you mist it. But if you miss any, there is a good chance it will come back. So be sure to get underneath the leaves and all the hard to reach spots. I like to pull the branches of each plant apart so I an spray in-between and throughout the canopy, getting the best coverage possible.

Another thing that is really nice about this all natural Dr Earth spray, is it is very gentle on the plants and you can use a heavy dose of it without damaging your buds if you are in flower. I still recommend going lightly with the spray around the buds, just to minimize moisture on them. After your initial misting, be sure to follow up each day with a light mist on areas still showing signs of spores.  Eventually the problem will stop showing and at that point you can stop spraying. You will also notice that sometimes the mildew does not completely dissolve and come off the fan leaf from the spray. In this case, take a paper towel, mist it with the spray and then wipe the leaf with it. This will remove all the leftover WPM.

Alright guys that is all I have on how to prevent and Cure WPM, but if you enjoyed the video please give us a thumbs up and comment below with your feedback. Also don't forget to subscribe to our channel. As always thank you for watching and until next time…


Dylan @ GreenBox Grown