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Black mold on new growth

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Black mold on new growth

Spotsy May 17, 2023 96 Replies 12,014 Views
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Spotsy

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#1
Hey growers.. running into problem this year on outdoor soil grow. New growth has black spoting on leaves as they start to sprout out of the top.. but it's not round spots. More like on edges as new growth sprouts out of stem.. had this issue last year too.. tentatively think it's a form of botrytis.. but not sure I'm in Virginia .. very humid in summer... Every year so far also got hit with grey botrytis.. but this is different.. saw thread last year about this. But no one really had a good answer.. I'll post pics
 

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MIGrampaUSA

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#2
Spotsy said:
Hey growers.. running into problem this year on outdoor soil grow. New growth has black spoting on leaves as they start to sprout out of the top.. but it's not round spots. More like on edges as new growth sprouts out of stem.. had this issue last year too.. tentatively think it's a form of botrytis.. but not sure I'm in Virginia .. very humid in summer... Every year so far also got hit with grey botrytis.. but this is different.. saw thread last year about this. But no one really had a good answer.. I'll post pics
Click to expand...

I've seen this issue before, but never experienced it personally. It looks funky and certainly isn't normal ... but I don't think its mold. I believe someone with more knowledge of plant diseases identified it as a "virus."

I'll be watching this thread to see what you find out.
 
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Spotsy

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#3
MIGrampaUSA said:
I've seen this issue before, but never experienced it personally. It looks funky and certainly isn't normal ... but I don't think its mold. I believe someone with more knowledge of plant diseases identified it as a "virus."

I'll be watching this thread to see what you find out.
Click to expand...
Hey thanks for that thought.. yeah this is some weird, non typical thing.. I just kept plucking out the whole top last year on affected plants. ,, But only one plant outgrew it.. I pulled up all but one of the affected plants last year.. and the one that outgrew it was a chocolope. So aggravated.. I figured it was a one off situation last year. But apparently not. I already had to pull up some this year.. so whatever y'all can help with this year
 
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MIGrampaUSA

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#4
Spotsy said:
Hey thanks for that thought.. yeah this is some weird, non typical thing.. I just kept plucking out the whole top last year on affected plants. ,, But only one plant outgrew it.. I pulled up all but one of the affected plants last year.. and the one that outgrew it was a chocolope. So aggravated.. I figured it was a one off situation last year. But apparently not. I already had to pull up some this year.. so whatever y'all can help with this year
Click to expand...
Here's where I saw it before:

Dark Purple Disease Affecting New Growth?

Has anyone seen this issue before? Temps have been hot: 28-31C Day / 15-22C Night with 75-85% humidity Avg. Appears to be affecting all plants in the garden except a freezeland/timewarp strain that had flowered itself and was in and out of veg/flower all summer. Other than that some 15 or 16...
www.thcfarmer.com
 
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Harpua88

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#5
This is very interesting. Spotsy how has the weather been so far? And what happens to these new growth leaves when they fully form? Does the discoloration stay? Is it damaging the leaves?

I've read horror stories about viruses hitting plants. I don’t know how likely they are....
 
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MIGrampaUSA

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#6
Harpua88 said:
This is very interesting. Spotsy how has the weather been so far? And what happens to these new growth leaves when they fully form? Does the discoloration stay? Is it damaging the leaves?

I've read horror stories about viruses hitting plants. I don’t know how likely they are....
Click to expand...
I don't know how likely they are either. I have heard that Massachusetts growers especially have been fighting Hop Latency Virus. I'm not sure how likely it is that HLV is what the OP's plant has.

On this thread, I'm here to learn. I have no idea what it is other than its not normal growth.
 
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Harpua88

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#7
MIGrampaUSA said:
I don't know how likely they are either. I have heard that Massachusetts growers especially have been fighting Hop Latency Virus. I'm not sure how likely it is that HLV is what the OP's plant has.

On this thread, I'm here to learn. I have no idea what it is other than its not normal growth.
Click to expand...
Yeah this is one of the unknowns (so far) that we need to learn about, with an eye on viral infections......

Unless it's something else. If it was due to cold weather like brief frosts at night, I'd believe that too. He said he's in VA, Spotsy are you up in elevation/the mountains?

My only other guess would be something with the soil or water......contamination or way too much or little of something?

It does look very much like that "virus" link though......
 
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Spotsy

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#8
Harpua88 said:
Yeah this is one of the unknowns (so far) that we need to learn about, with an eye on viral infections......

Unless it's something else. If it was due to cold weather like brief frosts at night, I'd believe that too. He said he's in VA, Spotsy are you up in elevation/the mountains?

My only other guess would be something with the soil or water......contamination or way too much or little of something?

It does look very much like that "virus" link though......
Click to expand...
Hey.. I was reading up on the HLV thing. But it does not seem to twist the leaves or damage the plant too much.. not up in the mtns... Perfect weather.. a little cool at nite maybe. But my other plants seem ok so far.. not strain specific either.. can't say what end result is. ,because I pulled all but one last year.... And that one I kept plucking the bad top out of till it sorta outgrew it. Soil is ffof planted in ground.. I'm on well water that comes out at 5.5 ph. so I ph up to 6.3 or so. Actually the pics here are from last year.. but the same crap is occuring on my crop this year too... Growing outdoor in VA is hard.... Humidity and bugs are off the charts.. but I grew some champion Acapulco gold 2 years ago.. so it can be done. Appreciate the feedback!!
 
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#9
Purple leaning plant in beginning flower would be my guess. Doesn't seem to be an issue but post in a week and let us know
 
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Spotsy

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#10
Spotsy said:
Hey.. I was reading up on the HLV thing. But it does not seem to twist the leaves or damage the plant too much.. not up in the mtns... Perfect weather.. a little cool at nite maybe. But my other plants seem ok so far.. not strain specific either.. can't say what end result is. ,because I pulled all but one last year.... And that one I kept plucking the bad top out of till it sorta outgrew it. Soil is ffof planted in ground.. I'm on well water that comes out at 5.5 ph. so I ph up to 6.3 or so. Actually the pics here are from last year.. but the same crap is occuring on my crop this year too... Growing outdoor in VA is hard.... Humidity and bugs are off the charts.. but I grew some champion Acapulco gold 2 years ago.. so it can be done. Appreciate the feedback!!
Click to expand...
Harpua88.. that link u sent is exactly what it looks like... I'm leaning towards virus.. it showed up 3 weeks after seeds sprouted.. so it can't be phos/ or nute deficiency, since I'm in ffof and it's so early in grow.
 
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Deadstill

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#11
Harpua88 said:
Yeah this is one of the unknowns (so far) that we need to learn about, with an eye on viral infections......

Unless it's something else. If it was due to cold weather like brief frosts at night, I'd believe that too. He said he's in VA, Spotsy are you up in elevation/the mountains?

My only other guess would be something with the soil or water......contamination or way too much or little of something?

It does look very much like that "virus" link though......
Click to expand...
It doesn't look like HLV to me, aside from that, HLV is very hard to diagnose and they say the only way to confirm its presence is with a PCR test.

This does look like the "Dark Purple Disease" that MIGrampaUSA linked, though. Which is a whole 'nother mystery yet to be uncovered in the cannabis industry.

To the OP, what kind of RH are you running in your grow and does it ever get fresh air? A lot of molds (if this is in fact a mold) can be held at bay simply by starving said mold of moisture. I.E. - avoid spraying your plants and keep the RH as low as possible for a week or two, and ensure fresh air is taken in at least once per day. A good air filter on the intake is very beneficial, as well. However, I am not certain this is a mold at all. It does look more like a virus of sorts.

One other piece of advice I can give, is try to quarantine that and any other affected plants separate from your main grow.

Edit to add - sorry I just woke up and I just noticed you said it's an outdoor grow so obviously there's not much you can do about the RH, quarantining and such.

If moving the plants is not possible, maybe at least try not to handle the infected plants, and if you have to, wear gloves and make sure you don't touch the clean plants after touching the infected ones.
 
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#12
Has the plant started to go into flower? What strain?
 
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2Bad

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#13
Wow this is actually crazy ill be following
 
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GNick55

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#14
is this outdoors?
in the ground or a pot?
did it get pretty cold out?
 
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Spotsy

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#15
Homesteader said:
Has the plant started to go into flower? What strain?
Click to expand...
Outdoor grow. 3 weeks old... Last year's was ac gold , chocolope,, actually last year it seemed to stop when it went into flower. Quality was not really affected... I agree it prob is not HLV. But I've hit it with antifungal to no affect so I do think it is some weird virus that is uncommon., But 2 years in a row??? WTF????
 
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2Bad

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#16
Spotsy said:
Outdoor grow. 3 weeks old... Last year's was ac gold , chocolope,, actually last year it seemed to stop when it went into flower. Quality was not really affected... I agree it prob is not HLV. But I've hit it with antifungal to no affect so I do think it is some weird virus that is uncommon., But 2 years in a row??? WTF????
Click to expand...
Did you reuse soil? or containers?
 
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Spotsy

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#17
2Bad said:
Did you reuse soil? or containers?
Click to expand...
No. I buy ffof new every year... Not really a fan of FF but it's easy to get.... I plant in ground. But it's showed up in both 25 gallon pots and direct bury in soil. Side note: I really appreciate all the growers chiming in... Anyone wants to D. M. Me, or talk on phone if u have experience with this.... It's cool... It's hard to keep texting and following all diff people on this site... I'm new to this app,, and tech in general.... Lolo not sure if that's even allowed or wise. But this crap is stressing me out!!
 
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#18
Spotsy said:
No. I buy ffof new every year... Not really a fan of FF but it's easy to get.... I plant in ground. But it's showed up in both 25 gallon pots and direct bury in soil. Side note: I really appreciate all the growers chiming in... Anyone wants to D. M. Me, or talk on phone if u have experience with this.... It's cool... It's hard to keep texting and following all diff people on this site... I'm new to this app,, and tech in general.... Lolo not sure if that's even allowed or wise. But this crap is stressing me out!!
Click to expand...
Wow I can't believe you spend so much money on soil. 50 gallons!?
 
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#19

Wtf? buds turning black and purple

Does any body else use Dr. Greenthumb seeds and if so do you also have the buds turning black and purple...I am not saying that it is a seed problem...i just want to know what to do about it....but only his seeds are doing this...ahhhhhrrrrggggg...i have 4 strains going these ones ..og kush...
www.thcfarmer.com
 
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#20
well if the answer to my question is yes than its more than likely a phosphorus lockout due to too cold of temps..
 
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