stem rotting at the base

I have a system where I grow seeds in rockwool cubes, then transplant them into net pots full of hydroton. But on EVERY one of my plants there's rot right at the base of the stem where the rockwool touches the stem. One stem rotted completely through, killing it. Obviously moisture from the rockwool cube is causing it but I can't take the stem out of the cube. What is my problem? Do I have the water supply tube too close to the stem? I started by changing the position of the supply tube to the bottom of the net pot. I guess that might help. Thank you in advance for any help. Also if someone can tell me how to delete a previous post I'd appreciate it.
Thanks,

i'm in jiffy pellets and mine turned to mush and rotted off ,i think it was due to a drop in temp ,it happened the day they started to break ground the root seems fine just above the line of the soil turned to shit and started to die

Sounds like root rot to me.

Root rot is a condition found in both indoor and outdoor plants, although more common in indoor plants with poor drainage. As the name states, the roots of the plant rot. Usually, this is a result of overwatering. In houseplants, it is a very common problem, and is slightly less common in outdoor plants. In both indoor and outdoor plants, it is usually lethal and there is no treatment.
The excess water makes it very difficult for the roots to get air that they need, making them rot. To avoid root rot, it is best to only water plants when the soil becomes dry, and to put the plant in a well-drained pot. Using a heavy soil, such as one dug up from outdoors can also cause root rot.
A large number of root rots are caused by members of the water mould genus Phytophthora. Perhaps the most aggressive is Phytophthora cinnamomi. Spores from root rot do contaminate other plants, but the rot cannot take hold unless there is adequate moisture. Spores are not only airborne, but are also carried by insects and other arthropods in the soil.
A plant with root rot will not normally survive, but it can often be propagated so it won't be lost completely. Plants with root rot should be removed and destroyed.

It ain't root rot. It's stem rot right above the soil/rockwool line.

like this??? this was on a grow of mine a month or 2 back, but she lived and made 40 grams fer me tho, didnt die off??

It's actually called "Damping Off". There's lots on the internet about it.

You are correct Wil - perhaps I should have used that term to be better understood, but it is basically the same thing caused by several different diseases/fungi.

"The single term used to describe underground, soil line, or crown rots of seedlings due to unknown causes is damping-off . The term actually covers several soil borne diseases of plants and seed borne fungi."
GWN

It's too wet, obviously.lol All you can really do, is water less,(or less heavily) and make sure you have good air circulation. It might also be a good idea to use some kind of anti-fungal spry too, until you get things straightened out.

WillMunny said:

It's actually called "Damping Off". There's lots on the internet about it.

Click to expand...

You are correct. Most times the pathogen is pythium.

Gonna be interesting regarding damp-off problems. I did everything one needs to make it happen recently. Check this out, post 1974.

OK fellers, sowed dem seeds this morn, 4 Styro-cups. Will see how this plays out regarding their health (pythium anyone?) as I gave them the same unsterilized crap I used to do other stuff in one gallon pots. I mean this mix is the pits, hell, I wouldn't wish it on my worst enemy, hah. I literally dumped bags of CHEAP topsoil, shovel loads of partially composted horse manure that's been sitting out in a pile, caliche from a pile in the field to offset the acidity of peat, etc. into my tractor's bucket and mixed with a dirty shovel. Only organic nutritional value is from the compost and the peat. Top of pots were dressed with Polyon, a 12 month slow release 18-4-8 pellet with micros.

Genetics should be excellent - potent, dense, stocky plants. It is one of my crosses - C99 X (C99 X Peak19), the latter being that bomb in the Spin-out thread. Probably shouldn't have used them as I doubt if I'll grow them to maturity. This is just an experiment for you guys.
https://www.rollitup.org/advanced-m...1706-uncle-bens-topping-technique-get-99.html

As an aside, for best seedling vigor and health, sow your seeds in pots that are at least 6" tall using sterilized soil. Jiffy peat pellets are a 'no-no'. Pythium spores invade the tissue at or below ground level, cause a dark watery appearance in the trunk, xylem function fails and the seedling collapses.

UB