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Old November 12, 2017   #7
GrowingCoastal
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Join Date: Jan 2016
Location: Vancouver Island Canada BC
Posts: 1,253
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Hi friend of Baikal.

I have used hydrogen peroxide for powdery mildew on the recommendation of a friend. It has to be applied frequently to work well.
Here is a link to a chart with dilution rates.
http://www.using-hydrogen-peroxide.c...-peroxide.html

And here is a thread on this topic I found by searching this forum when I had problems.
http://www.tomatoville.com/showthread.php?t=33102
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