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I also would say mites check under leafs for wite gray tiny bugs /mini webs. If you varify you have them i woild recommend the 3 day rule . #1 get some blue dawn soap . #2 get a mister or pump sprayer . #3 get some neem oil if you can . for 3 days straint spray dawn soap mixed with water (1 tbs dawn soap per gallon of water). Then for 6 days spray with dawn soap 1tbs a gallon and 1 tbs a gallon neem oil alternating water every other with strait water . the after that spray just water every 3rd day for 9 days . make sure to spray under leafs and grow room with mix. Also spray right at lights out or pull lights up if possable. Clean grow room , all equipment , house , close and keep things clean . you can get rid of them if you have them . get on it soon if its mites .
Looks like your under a house and try to grow in a place like that can be a breeding ground for bugs and mold . put some plastic down at least and wipe up excess water that is on floor and walls after sprying. It looks like you have plastic for walls aswell so i would remove it and replace . if you can get neem you can use just dawn soap at 1 tbs a gollon but i strongly recomend it mites have a tendency to get immune to treatments of just one product . u might want to incorperate a preventative maintenance program of spraying neem 1tbs per gallon and dawn soap 1 tbs per gallon (in the same gallon ) every 20 days or so in veg room . flowering room is a bit different . i dont like to use sprays in flower unless absolutely necessary after week 5-6 of flowing . good luck hope this helped?
Looks like hemp russets to me, sorry man. Get a 100x scope and check them out. You're going to need to dip them in some avid or forbid and clean everything. After knockdown ambyseilus andersonii mites and og biowar / met52 ec work well.