Shadowsfall47
Member
Someone please help me identify this issue. We have had a ton of rain lately and my outdoor plants have this black residue on them.
Wtf is this!?!
- Thread starter Shadowsfall47
- Start date
OSBuds
Well-Known Member
How to fix Cannabis Phosphorus Deficiency (P) Pics & Symptoms
Phosphorus deficiencies cause dark splotches on leaves and can appear at the bottom of the plant on some of the oldest leaves. Learn to spot & fix the issue.
www.growweedeasy.com
Green_Alchemist
Well-Known Member
Looks like genetics,
I’ve had a few throw some purple colour like this early flower, nothing to worry about IMO.
I’ll include a photo of a previous plant I did that threw out some awesome purples
I’ve had a few throw some purple colour like this early flower, nothing to worry about IMO.
I’ll include a photo of a previous plant I did that threw out some awesome purples
dubekoms
Well-Known Member
Possible bacteria or fungal infection. Read this thread https://www.rollitup.org/t/purple-growing-tips.971988/ look up black death on icmag too
Sir Napsalot
Well-Known Member
I looks like some sort of mold/fungus to me, rather than some sort of deficiency
That is exactly what my one plant had. I cut off every growth shoot that had that stuff. I read that it's phytoplasma and it's spread by leaf hoppers. I didn't want to take any chances of it infecting my whole grow so I chopped it all off.
If it's not phytoplasma, please let me know what it is. I'd rather not cut away any more of my grow if I don't have to
SwankDank
Well-Known Member
Mine are in the ground, makes me curious what it could be since it's only bothering yours that are in the ground. It only effected one of my plants, none of the others that are right next to it. Very weird
Seawood
Well-Known Member
This same issue comes up every year. There is some type of phytoplasma disease that resembles this “condition” but in most cases, it is not the dreaded Black Death as it often referred to.
I have had it the past 3 years. First year it was quite extensive and freaked me out so I cut A LOT of tops trying to prevent any further spread. All that did was reduce my yield. The tops I left just grew out of it. The last couple of years I only had a few areas of my plants affected and did nothing about it. The first year, pretty much everyone I talked to locally had seen the same thing to some extent.
It always shows up as flowering starts. Every time. So it’s either environmental or a slight nutrient deficiency (P) as the plant transitions. Try upping you’re flowering nutes (phosphorus) and stop cutting away your yield. Don’t panic or overreact. Just stay the course and all will be fine, I promise!
I have had it the past 3 years. First year it was quite extensive and freaked me out so I cut A LOT of tops trying to prevent any further spread. All that did was reduce my yield. The tops I left just grew out of it. The last couple of years I only had a few areas of my plants affected and did nothing about it. The first year, pretty much everyone I talked to locally had seen the same thing to some extent.
It always shows up as flowering starts. Every time. So it’s either environmental or a slight nutrient deficiency (P) as the plant transitions. Try upping you’re flowering nutes (phosphorus) and stop cutting away your yield. Don’t panic or overreact. Just stay the course and all will be fine, I promise!
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That is exactly what I am seeing. So it's just phosphorus deficiency? FML, I wish I didn't cut it away. I got so panicked and didn't want it to spread that I chopped a bunch away....ugh. Thank you for the heads up.
Seawood
Well-Known Member
Yes, that’s been my experience. Nothing you can do now...it’s still early enough that your plants should recover pretty well and carry on. Now you’ll know for next time. I did the same thing as you first time I saw it. lol
If it did turn out to be the phytoplasma infection/disease, which I’m sure it’s not, your plants would be screwed anyway...so there’s really no point in doing anything as from what limited cases I have read about, there’s no cure for it.
Thanks for the info man!
Nutty sKunK
Well-Known Member
Just incase someone thinks it’s a P deficiency it’s not.
P is a mobile element. Any deficiencies exhibit there symptoms on lower leaves.
The other first tail tale sign is purple petioles/blueish hue appears to the green leaves
P is a mobile element. Any deficiencies exhibit there symptoms on lower leaves.
The other first tail tale sign is purple petioles/blueish hue appears to the green leaves