Need to know how to prevent plants from getting downy mildew, and how to treat if my plant got downy mildew using chemical and organic controls.
Certified GKH Gardening Expert
Here is some information on prevention:
Treatment depends on which plant is affected. For example, here is information on treating downy mildew in cucurbits (squashes, cucumbers, and melons):
Here is one on basil downy mildew: