Black at intersection of leaves and stem?

This is a sugar plum clone I have in my veg room grown in 80% blackgold soil / 20% modified supersoil. I think it is about 3 1/2 weeks since it rooted. The rest of the clones seem to be fine other than a bit of magnesium deficiency. The problem developed when it was in a solo cup, I just transplanted it yesterday into a 1/2 gal. Typically I would water only after the cup got very light, if anything they were underwatered with ph between 6-6.5. Recently they were kept more moist because I was soaking with mosquito dunk water etc. The temps have been down recently because I moved some CFL lighting out when the mature plants went to the tent for flower. It hits the low 60's on a cool night.

I am thinking it could be some kind of insect attack or maybe the medium ran out of nitrogen or something else? I haven't been feeding them much at all.

This question is out of curiosity mostly and to help anyone else who may have something similar. I expect that this plant will probably die. I didn't see any posts with anything looking like this plant when I searched. Thanks

Wow,never seen nothing like that,curious on what the hell happend to her

Thanks, me too! I can't find anything on this specifically. I did find a great reference for cannabis diseases, fungi, viruses, pests, bacteria etc...
There are at least 88 types of fungi that can attack cannabis. Here is the link: http://www.hempfood.com/IHA/iha03111.html

Not even sure if it fungi. Maybe a nematode that attacks the roots?

I was looking over my plants today and saw some black/grey areas on some of the leaves of a couple other clones. It isn't starting from the same area but it is the same color. Whatever this is developed quickly (2-3 days) so I am not really sure what they looked like at the very beginning.


Any ideas? Even a wild ass guess from an experienced grower would be appreciated.

Looks like Fungus... IMO
Cold will make your plant purple/black but that would start out on the leaf tips
Your is the stems, and starting at the base of the leaf.

Thanks for the reply! She is going down hill fast at this point, I think all ability for the plant to deliver nutrients has been destroyed. I got a sample of Pure Kapow and 3-way the other day (fungicide / insecticide). I will hit all of them with it later today.

Here is a pic, I think I will do an "autopsy"... i'm curious what the roots look like

pot plant ebola