lower part of plant die at flower

[vladimir882]

hey! my indoor plants have this weird issue. they grow in soil, 11 Liter pots.
it's only in the first 30cm from the soil. everything else is just fine
It's like some stems top"die" out of nowhere, and their leaves get yellow from the bottom up (but after their main top is just dead). then the whole branch die in week or so.
also worth noting that the overall smell at the lower part of the tent is not great, smell weird.
humidity is non issue. never goes above 60% and on avrage probably 45%.

what the hell is that? I have 4 different plants in the same tent, and it appears on everyone of them....week 4 (almost 5) of flower
and the plants look amazing and grow nice beyond that.

 

[mexweed]

it happens, more than likely due to root space, just trim the lower stuff off "lollipopping"

 

[troutman]

Never saw that before.

Is the pH ok? A lot of problems are the result of pH extemes.

 

[vladimir882]

it happens, more than likely due to root space, just trim the lower stuff off "lollipopping"

root space is limited (11L pots, and they filed it even before flipping to flower..) and also I observed this issue in my previous grows, that was quite successful

Never saw that before.

Is the pH ok? A lot of problems are the result of pH extemes.

nah, everything is 100% right. forget to mention that they grow in soil.
anyway, everything is completely optimized. we can rule out pretty much any nute/ph issue, my worry is that this is kind of fungus/root rot or something like that

 

[mexweed]

it could be as that looks a little gnarlier than the typical lower fan leaf turning yellow and dying off mid-late flower

filling out a pot before flipping is not good, the roots still need room to stretch during flower, my advice would be since you are limited in container size to flip as soon as you transplant into those containers

 

[Hammerhead]

The lower part looks like it was left too long in the dark. Top part possibility root rot related. Nothing else comes to mind. Hard to say with both issues going on. It doesn't look like it will survive with no good growth left.

 

[William76]

Fusarium wilt/dampening off maybe?,76

 

[vladimir882]

The lower part looks like it was left too long in the dark. Top part possibility root rot related. Nothing else comes to mind. Hard to say with both issues going on. It doesn't look like it will survive with no good growth left.

the whole "issue" only appear the the bottom part of the plant, from soil level up to 30cm height. the plant is 1.3Meter height. and apart for this bottom part it looks and grows incredible. so they are ofcourse not getting any light is those branches are buried deep behind the canopy that get the light.
so the picture of the issues are pictures of branches that are at the very bottom of the plant. affected branches are 100% not going to survive and they completely die in week or two from the first signs for the problem. but the rest of the plant look and grow great.

also noting, that this issue ALWAYS appear in mid-late flowering, not before that.

Fusarium wilt/dampening off maybe?,76

that's also my guess, I could rule out dampening off almost for sure
Fusarium is my current guess, and I'm really hopeful that's not the case.
but considering that this issue is in the whole tent (4 plants in different pots), and that in my previous grows I had this issue as well, it just fits Fusarium properties

 

[St. Phatty]

Are you using an LED light ?

it's almost common for LED lights to cause problems - in flowering - that growers blame on their soil.

The paradox is, LED lights can work real good in Veg.

It doesn't mean that HID lights always work. I have a 250 watt Metal Halide that needs replacing because the spectrum deteriorated. That bulb only has about a year of use.

 

[vladimir882]

Are you using an LED light ?

it's almost common for LED lights to cause problems - in flowering - that growers blame on their soil.

The paradox is, LED lights can work real good in Veg.

It doesn't mean that HID lights always work. I have a 250 watt Metal Halide that needs replacing because the spectrum deteriorated. That bulb only has about a year of use.

what you are saying here is bro-science not backed up by anything. that's just blaming the light while they can't do anything related to this...

 

[vladimir882]

btw, I sent a sample of dying stem to a lab to check for fungus from common types. will get results in 19.6

 

[Lester Beans]

Looks like overwatering to me. Combined with the smell you describe it points to root rot brought on by overwatering.

 

[William76]

Fusarium thrives in humid/wet conditions,and can cause funky smells,76

 

[vladimir882]

confirmed "Fusarium oxysporum" as main pathogen by lab.


I hope they will survive another 3-4 weeks and finish this round nicely.