Mildew spots!

My crop is about to be harvest in week and some of them are getting mildew spots on some of the leaves. I was wondering if theres a spray that i can use to help with the spots. or just wait it out.

you can use 1 parts lemon juice concentrate with 2 parts water and spray leaves down . this brings down the ph to 3.2 on the leaf surface

imo alkaline solutions work better