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VanCplGrows started grow question 3 years ago
Brown/rust spots have been increasing on one of my 3 plants.
Appearing on upper and lower, newer and older leaves. Does not appear to be a light/heat issue.
Treating it as possible Cal def by increasing cal-mag nutes.
Week 8
Leaves. Color - Mottling
DissNoof answered grow question 3 years ago
hey there , calcium was the symptom but light stress was the culprit i'm afraid, you gotta lower your lights to around 30cm (max) - 40cm (min) it seems close, but in fact that's pretty normal, that plus a regular regimen of cal mag and the problem should stop spreading almost immediately. Hope this helps ! :rocket:
GreenHouseLab answered grow question 3 years ago
Yes you have calcium deficiencies but don't over do it as you can also have issues with excess.
Stick answered grow question 3 years ago
Hi @VanBrando! Nice ladies in there :heart_eyes: I'm thinking more of a Phosphorous deficiency, considering you're giving loads of nutrients, I think your plants had enough Calcium and Magnesium. My bet is that you're having salts buildup in your medium, because of an intense feeding schedule and probably a lack of runoff, your rootmass is flooded with old nutrients, and is unable to manage nutrients intakes anymore (lockout leading to deficiencies). In this situation I would flush the medium with tap water buffered at pH 6.2, then help the medium to dry by putting a small fan blowing a continuous breeze on the container's surface. Once almost dry, see how this goes, and probably give it a good meal with Phosphorous and Potassium. Affected leaves won't recover but the new ones should be healthy. Hope this will help, keep us updated and happy growing! :facepunch:
Removed answered grow question 3 years ago
Agree that's probably not light stress. Calcium looks like the culprit. Looks like you have your PH in order and are treating it properly. Good luck and happy growing !!:four_leaf_clover::muscle:
LongJohn420 answered grow question 3 years ago
You are right seems like calcium deficiency.. hope you get her right..and YOU WILL :joy:
Happy growing!
Hellishjam answered grow question 3 years ago
Looks like it could be rust fungus, rust fungus is an air bourn fungus can be caused by poor ventilation and spreads to other hosts, try gettin more ventilation in your grow room. Check everything in your room to make sure it’s working and we’ll ventilated. Trim some lower leaves and get some air movement under your plants. I wouldn’t spray anything unless it’s safe to spray on fruiting crops. Hope this helps good luck with the grow