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Milk, water, baking soda mixture for powdery mildew #573945

Asked June 25, 2019, 12:33 PM EDT

is a mixture of milk, water, & baking soda effective/recommended for powdery mildew on summer squash & cucumber leaves? If so, what is the ratio of ingredients?

Dorchester County Maryland

Expert Response

Hi- research studies indicate that commercial bicarbonate (sodium and potassium) fungicides are not very effective against powdery mildew in cucumber family crops.
http://web.pppmb.cals.cornell.edu/resourceguide/

We would not recommend mixing and spraying the materials you reference.
Elemental sulfur may be the most effective organic fungicide for controlling powdery mildew. Horticultural oil may also be somewhat effective. Do not spray either product during hot weather.
https://extension.umd.edu/hgic/topics/powdery-mildew-vegetables
Jon
Answered by the Home & Garden Information Center's Maryland Certified Professional Horticulturists Replied June 25, 2019, 2:39 PM EDT

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