I don’t know what’s wrong with them 
been fighting white mold with baking soda and water mix.
Natural light pic please.
Dont treat first if U dont know cause. Its make sometimes things worst.
First guess is caltsium or water drops.
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Yes if you get nuye water on the leaves it can cause this. Also you can treat mold or mildew with h2o2 or hydrogen peroxide diluted in water and sprayed on