Squash Plants
Q.

Powdery Mildew on Squash

Zone southern Ontario Canada | szmaple789 added on July 20, 2015 | Answered

I have powdery mildew on zucchini plants. I read that a 9:1 solution of hydrogen peroxide spray will kill the mildew. I cut off some of the nastiest looking leaves but put them in my composter (a mistake I now realize). Can I spray the peroxide mix into my composter to kill the spores?

A.
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Downtoearthdigs
Certified GKH Gardening Expert
Answered on July 20, 2015

If you can retrieve any of the leaves, do so.
If you don't have a large amount of compost, you may want to discard it.
If not, I would treat the compost, I may suggest switching to Neem Oil for this.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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