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With the citric acid foliar spray should I be applying every day now until harvest?

Thanks for the Citric acid idea. I assume I could mix my own from just citric acid powder and water, do you have a recommended ratio? And do I just spray my plants all over or just target the few areas of mildew I can see? Thanks again for the help.

It’s been really hot and humid here in Ontario for the last week and I’m worried that this white/grey stuff is the start of mould/mildew on my outdoor plants. If so what can I do about it? 5th week in flower. This is my first grow and I’ve made lots of mistakes, but thought I was starting to...