This is my first time growing. I have two potted autoflowers in a greenhouse on the foggy norcal coast. They seemed to be doing great until a couple days ago when a few of the leaves on both plants seem have been afflicted with something. I think overall the plants still look ok, but I included a couple pictures. Any idea about what this might be?
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What is the feeding schedule on that, what all is it getting.
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Hi, they are potted in 420 mix and are getting 2-3-2 plant food about once per week. Whatever happened to the leaves seems to have occurred in a single day. I thought maybe they got sprayed with something, although I didn’t think so. I have been battling fungus gnats in my greenhouse the last couple weeks
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I just pulled a few leaves that look similar, and I think my issue was pH swing. I too was recently battling gnats, had to do a couple hydrogen peroxide soaks and I also “top dressed” with broken-up Mosquito Dunks which I’m certain the combo caused a mad pH swing.
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That will do it, gnats suck.
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Because it isn’t widespread, I wouldn’t trip for now 
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I’m dealing with the same outdoors after heavy rain. Thrips too, pests are a mofo outside.
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Are you using rainwater or distilled water ,perhaps.