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Growths on underside of leaves

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    HELP! Growths on underside of leaves

    So I've been having problems with the current batch. Most of Strain #1 have curled new leaves, seems like either Nitrogen toxicity or overwatering, I've adjusted down on both of those, but it's too early to say for sure yet. Strain #2 is not having any curling problems, but I notice some spots of the underside of the leaves today. I had mites in the past, so I feared the worst, but putting them under the microscope reveals something I've never seen before. It almost looks like some sort of cancerous growths to me.

    Has anyone seen something like this before? Could it be the result of excess nitrogen and/or watering?
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