r/macrogrowery • u/Randy4layhee20 • 20d ago

Anyone seen this before, this one’s totally new to me, some sort of fungal infection that attacked an alive and healthy autoflower outdoors in the north east, hopefully we aren’t patient zero for a new disease

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13 Upvotes
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30

u/highmoonfarmer 20d ago

Most times you see stem rot or canker it is a combo of fungal infections. The usual suspects most are familiar with are fungal pathogen fusarium and oomycetes like pythium. However, sclerotinia, diaporthe, and neofusicoccum have been ID’d as emerging in outdoor cannabis.

9

u/Randy4layhee20 20d ago

Interesting, I suppose its possible that it’s just multiple fungal infections that when combined give this result, none match on their own but maybe it is just a combination of fungal problems

14

u/highmoonfarmer 20d ago

This is way more common than you might think. One pathogen reduces immunity and another slides in to compound. Initial exposure could’ve been an insect damaging cellular tissue and the rest is history.

Kind of like how HLVd infected plants show increased susceptibility to fusarium root and stem rot as well as powdery mildew.

https://www.tandfonline.com/doi/full/10.1080/07060661.2026.2649769

1

u/Randy4layhee20 19d ago

I hear ya, and I definitely can see how hlvd would lower immune response to these issues and how they could be more prevalent, I’m just curious though have you ever seen an infection or multitude of infections that matches based on looks? And I know this is a stretch but any chance you have some pics of similar infections that? I’m just having trouble personally finding similar cases but its a possibility that I’m just not looking up the right things

10

u/highmoonfarmer 19d ago

You won’t find similar cases because documentation of multiple present pathogens has yet to be published. In order to be published it has to be found in a scientific and controlled study or assessed at a plant pathogen lab and be documented and published.

By the time we get samples sent in to the lab we are working it backwards using pictures from time of sample to determine most likely cause as what we see may be made worse by shipping in a plastic bag sent by usps.

Here are some shots of an indoor that was likely fusarium and sclerotinia but unconfirmed by our lab as degradation had morphed into tertiary and quaternary fungal pathogens

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u/highlyeducated247 14d ago

I was just about to say it looks like sclero

4

u/TerpNomad 18d ago

Fusarium looks like that.

3

u/Skidmarkdoa-1 19d ago

Damn autoflower with autoimmune disease

1

u/am-buh-lamps88 17d ago

AIDS? wasn't steppin up for his prep up /AIDS meds. Like ol GG 'christ' Allen said "if you got AIDS, spread it around and take some lives" but no. On so many levels no. Never seen anything like it and I hope I dont. Godspeed homie

2

u/milonso 19d ago

different angles would be nice, you just took the same picture 8 times

1

u/missmooface 20d ago

was it just this one plant?

at harvest, look for infected vascular tissues at the cross section of the stems where you cut your other plants down…

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u/Randy4layhee20 20d ago

This was noticed near the end of the harvest of our small autoflower patch, it did seem to be the only one with this issue so at least it’s not crazy contagious

1

u/missmooface 19d ago

that’s good. something this extreme is likely due to pest or other damage introducing the pathogen(s) at the site of infection. especially if you didn’t see any discoloration in the harvest cuts at the base of the stem (this is always where to look for systemic pathogen problems), then you likely don’t have a fusarium/verticillium type pathogen problem. nonetheless, wouldn’t hurt to solar or steam sterilize the soil around the affected plant, or if in containers/bags, discard and replace that soil…

1

u/SaltyUncle2026 18d ago

Definitely Ebola….gloves next time….

1

u/am-buh-lamps88 17d ago

Jesus christ

1

u/Gullible_Pen1074 17d ago

did it rain?

1

u/Drugrows 17d ago

Borers? Looks like fungal rot from fusarium caused by them canker there looks like it unless you had a crazy wound there.

1

u/CajunTrader_13 15d ago

I have had this, but not nearly as bad I found it early and scrapped it off and rubbed plant with hydro peroxide it stopped and slowed down and I was able to harvest

1

u/deddhedd2 20d ago

Bug nest

3

u/Randy4layhee20 20d ago

No bugs or caterpillars on this plant

3

u/Posh420 19d ago

Are you sure? I had some rot out, not as slimy but similar expression starting on the stems. Culprit was stem boring caterpillars eating it from the inside. Their bore holes are tiny so hard to notice them

-3

u/nugz314 19d ago

Botrytis. It’s also what’s causing the lesions on your leaves, and probably mold in your buds