Powdery Mildew

Question

I have Peony with powdery mildew – I plan to follow the homemade remedy spraying with the blend of baking soda, dishwashing liquid and horticultural oil. My question is: will using food based pure canola oil be an effective substitute for horticultural oil?

Thank you, Denise

Answer 1

The recipe for the homemade solution is below. You can use canola oil instead of horticultural oil both are equally as effective.

Homemade remedy: Mix together a tablespoon each of baking soda, horticultural oil (or canola), and liquid dish soap (without bleach) with a gallon of water.

For more information on peonies and powdery mildew, please visit the following link:
https://www.gardeningknowhow.com/ornamental/flowers/peony/powdery-mildew-peonies.htm