Q.best control of powdery mildew in greenhouse
What is the best control of powdery mildew on potted petunias in greenhouse

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on February 4, 2018
I prefer neem oil, as long as you do not apply it is direct sunslight. This will take care of the issue quickly. An alternative would be to spray with a mix of one part peroxide, and three parts water.
Here is an article that will give you many other ways to control insects, fungal/bacterial infections, and many other ways to make these yourself: https://www.gardeningknowhow.com/special/organic/
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