This is hydroponic Autoflower, only 2 weeks old - northern lights. Thanks so much everyone for the help
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Looks like older damage. Maybe water or collision. If it’s not spreading, I wouldn’t worry about it. Nice looking plant. I have a mom in DWC. I love it…
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What kind of airflow do you have? I recently ran into a problem with WPM white powder mildew. It looks a lot like this, it’s caused by low airflow and high humidity. If you see another leaf I would do surgery. If it is WPM dispose of the infected leaves, wash your scissors or knife and wash your hands good. With the weather as crazy as it is this may be a problem. It looks like your running Blurple lights so your yellow spots may be white. Cat