Kale mold or mildew

As the sun is getting lower in the sky with each fall day, our kale is developing a milky-white mold or mildew on its leaves. Otherwise it looks pretty healthy. Can anyone recommend a non-toxic method for putting off the inevitable as long as possible?
Googling I found a reference to spraying with a dilute milk solution. Didn't work for me.
[Pacific NW garden]
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