Looks like heat stress to me. You wanna typically keep your temps in between 70Â° and 80Â°. 85Â°+ might burn your plant.I have read allot of post and tried to figure out what is going on with this .I'm not sure if its fungi or a deficiency? I know its a redundet question. I will say the humidifier sprays directly toward the plant that shows this..I was thinking it had something to do with the water vapor, any thoughts?
Ff soil, ff nuts,400w mh light temps on the high side 74-86, rh 25-35% watering ever three days, alternating food with pH water. All my water is run threw a filter and the pH to 6.3.
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Sorry for not getting back to u Dave. They are autos growing in coco peet. Indoors. Using greenhouse power feed. Using a 600 w led. Will take pics soon as lights on.Indoor? Outdoor? Soil? Hydro? Nutes? Lights? Way too many variables without more info. Pics of the whole plant would help.