White powdery stuff on the leaves

[Francesca]

Hi I noticed this weekend my cannabis leaves have a very light white stuff on the leaves it looks like mildew not a lot but most of the leaves have it what can I do to fix this problem help please

 

[Rwise]

Air flow, this is key, if you can reduce humidity, I am trying peroxide and water, 1 T H2O2 to 1 cup H2O, Trifecta Crop Control works but costly, remove badly infected areas.
More details helps. Are they inside or outside?

 

[SoOrbudgal]

Yes what Rwise said to do. Air flow and keeping branches from touching in high humidity.