I have always had success with baking powder, 1 heaping tablespoon per gallon as a powdery mildew control, it works immediately and I have very little subsequent problems.
I just read that
potassium bicarbonate is more effective
mixing a little dormant oil helps keep it on
there is no problem with the sodium accumulating in the soil or the plant (I think I read that)
that baking soda is more effective than conventional commercial preparationg
For more info visit: http://www.attra.org/attra-pub/bakingsoda.html
Kevin Bradley
Wisconsin,
zones 5 and 3
<html><DIV>Kevin Bradley </DIV></html>
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