It looks like Oidium indeed. You could try and higher the pH by praying on the leaves a solution of baking soda (Na2HCO3) in water 1:100 (i.e. 10 gr. per litre). That would get rid of it in 3-4 applications at the most.
Posted
by: Guillermo
(1 point)
Posted: March 15, 2015
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