I think my zucchini is infected with downey mildew. What can I do about it?

Asked June 28, 2013, 1:30 PM EDT

I think my zucchini is infected with downey mildew. What can I do about it?

Medina County Ohio

1 Response

On zucchini and most cucurbits, in fact, symptoms of downy mildew and powdery mildew are very similar. One obvious difference is that with powdery mildew the spores appear on the top surface of the leaf, it looks like someone has thrown flour on your plant. With downy mildew the spores are on the underside of the leaf.

Depending on how far the fungus has spread you may be able to stop the spread and save the plant by using a fungicide listed for zucchini and powdery/downy mildew. (always read the label). It will not cure the infected leaves but will hopefully keep it from spreading to new growth.

I am including a link to a good publication
http://www.uaex.edu/Other_Areas/publications/PDF/FSA-6019.pdf