My new hydro gro op has been doing.g great besides one factor I know it's probably a deficiency but can you guys help me out with what??
Maybe it's multiple things. Could be thrips or gnats... have you been spraying the plants with anything because it could be burning the leaves or magnifying the light to burn them... Sent from my SM-G955U using Grasscity Forum mobile app
For deficiencies I go here >>Nutrient Deficiencies in Plants But that definitely looks like mildew....
You need to provide a whole lot more details on your setup and feed schedule if you want people to make more than just guesses as to what's going on. Yes, you have deficiencies but why is the unknown without this info. The red, thin main stems is a big indicator of maybe ca/mg, or lockout - could be pH... Maybe bugs as well... Who knows...