S. African grower
Well-Known Member
One of My trees are producing yellow spots on the leaves.. What could be the cause and what's the solution.. It's only happening to 1 out of 7 trees.. Symptoms appeared over night after a plain watering.
Yellow spots on leaves?
- Thread starter S. African grower
- Start date
3rd Monkey
Well-Known Member
Do you foliar feed?
What's your humidity?
How's your airflow?
What medium and is it reused?
Are there spores on the leaves?
Looks a hell of a lot like septoria but could be the light.
What's your humidity?
How's your airflow?
What medium and is it reused?
Are there spores on the leaves?
Looks a hell of a lot like septoria but could be the light.
Demarz
New Member
Hard to see but looks like it may be yellowing from bottom moving towards top? If so that can be a Nitrogen Deficiency, I would also double check your run off for PH again. I had this happen in my plant that was 5 to 6 weeks into flower, My PH had dropped without me knowing, which caused Nitrogen lockout.
You have alot more research to do before giving out 'advice' like this!
That has zero to do with nitrogen. Im not sure what caused it, but it most certainly isn't nitrogen! You're also misled to think that it was low ph locking out your nitrogen..nitrogen is the most available element, in both soil or soilless mediums. It has the widest range of uptake in terms of ph...so if your nitrogen is locked out due to a ph issue, you better believe that the plant will look absolutely terrible, as if nitrogen is locked out due to ph, so is every other element! keep reading, it never hurts! 
faultfiction
Member
could be potassium
S. African grower
Well-Known Member
Thanks for all the replies guys. Sorry for my late reply I been working.. So seems to have started on the top and move down. I do not foliar feed as it's already like mid flowering,it is not reused soil and there are other plants even closer to the light and arnt showing any yellowing. Note this is a pheno so could this be the reason it is more sensitive than the rest? *one other plant has slight yellowing in the lower parts the plant
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3rd Monkey
Well-Known Member
Check your ph. That's the only thing I can see it being. Good luck.
Couch_Lock
Well-Known Member
Make sure you TEST the water for its PH, always.
Keep using good water for the next week, see what happens.
Keep using good water for the next week, see what happens.
3rd Monkey
Well-Known Member
Kind of resembles copper def, doesn't it? I actually had to look that up because of the coloration. Feckin weird lol.
Couch_Lock
Well-Known Member
Ya, his upper leaves are affected more then the lower. Kinda says he hasn't been checking water PH often.
Im not sure about being copper related. Copper deficiency will almost mimic a nitrogen toxicity, except the tips/margins would eventually turn a greyish/silver color. Also it would be contained to the upper part/new growth.
I see the plant to the bottom left and right of this plant, going the same route. I have personally never had this kind of spotting, and i have tried every deficiency and toxicity known so i can see how it all looks first-hand. Do you have a pic of the bottles you are feeding with..their exact ingredients? For now, i have to think it's something ph related as well..a drastic change suddenly?
3rd Monkey
Well-Known Member
I have never seen copper deficiency. I tried a search on "neon green spotting" lol. That was the closest I found.
I originally thought septoria, but I've never seen it look like that.
Copper def's are quite rare! If it was ph related, then iron and zinc deficiencies would show first and more pronounced. This is assuming that somewhere in some nute...or tap water..there is copper.
I was thinking a disease as well, but with that i have no experience at all, even with bugs, i only know of white flies and spider mites.
3rd Monkey
Well-Known Member
Copper is a pretty common element in just about everything, just like zinc and iron. So I agree that ph would have to be mcfuckity to show any of those instead of those trace elements missing.
Doesn't look like any bugs I've ever seen, granted I haven't seen them all. Definitely not aphids, gnats, mites, or flies.
Only disease I've come in contact with is septoria but that wasn't even in a cannabis plant. Didn't look anything like that either, with the exception of the spotting. Was NOT that neon color though. Could be the lights I suppose.
Guess we are back to ph lol?
3rd Monkey
Well-Known Member
So, I was just dicking around looking at deficiency pics on google images and came across one that looked very similar. It was P deficiency. The lighting is what made it look that way. Same neon tinge.
I'm not saying that's what this is, but maybe a flouro light pic would help.
I'm not saying that's what this is, but maybe a flouro light pic would help.
Such an exaggerated P def wouldn't pop up overnight though. maybe what would help is a pic of the plant say in the past week leading up to this..and yes..a pic in normal light!
Im curious at what it may be...maybe a cat or a raccoon snuck in and pissed on her? lol
One thing for certain..temps are high...leaves are showing alot of curling! The only time i had this happen was when i had to move a plant in my closet and it was warmer in my room with lights out than in her regular space..the plant had yellowing 6 hours later when i took her out..she was 100% perfect the night before when going in..harvest went well though. The yellowing was more uniform though..odd leaves here and there, but it was together..not all patchy like this.
3rd Monkey
Well-Known Member
I can't imagine many deficiencies just popping up overnight and doing that much damage. There are always foretelling signs. Nutrients are mobile, but not that mobile in my experience. The only thing more mobile is water... And maybe coon piss lol.Such an exaggerated P def wouldn't pop up overnight though. maybe what would help is a pic of the plant say in the past week leading up to this..and yes..a pic in normal light!
Im curious at what it may be...maybe a cat or a raccoon snuck in and pissed on her? lol