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is this powdery mildew?
MrBlocc420answered grow question 5 years ago
Thrips. Insect issue a neem oil should take care of the problem.
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Experimentgreenanswered grow question 5 years ago
Hello,
Have you tried to wipe it off with a wet paper towel? If so it could be pm. If so it could be pm versus some sort of bleaching or bug. Hows the airflow? Increase if possible and then spray with a diluted water/hydrogen peroxide spray.
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