Growing in organic soil and never seen this

Rdub · Feb 27, 2026

Hey all been growing in build a soil style organic beds for awhile now and never seen this. I lost a fairly sizable branch to it already. There’s little black bugs near the affected areas,( might be un related ) that are too small to reasonably get a good picture of. Any ideas? At first I thought it was rot from staying to wet around the base but now the little bugs got me worried

JIMKSI64 · Feb 27, 2026

Not sure what you have but if it was in a tomato stem it gets pulled and thrown away very far away from my patch and I recheck drainage.
Looks like the F word.
Fusarium.

orggrwr · Feb 27, 2026

Yeah, it looks like stem rot. I had this problem last summer in a greenhouse. Didn't notice it until a whole branch wilted. Found rot that had encircled the wilted limb and was working it's way around the stem. Cut away all i could see with razor blade and treated with hydrogen peroxide. Lost the one limb but saved the rest of the plant. What is your environment like? Stem rot should only happen in very high humidity. I'll try to find pics of my rot.

Rdub · Feb 27, 2026

orggrwr said:
Yeah, it looks like stem rot. I had this problem last summer in a greenhouse. Didn't notice it until a whole branch wilted. Found rot that had encircled the wilted limb and was working it's way around the stem. Cut away all i could see with razor blade and treated with hydrogen peroxide. Lost the one limb but saved the rest of the plant. What is your environment like? Stem rot should only happen in very high humidity. I'll try to find pics of my rot.

Thanks I would appreciate that. Vpd is about 1.3. I think I was soaking the base a little to heavily during feeding and then covering with my poor man’s mulch black plastic garbage bag and that might be the cause, how did you treat with hydrogen peroxide? Just spray it directly on the affected areas? Dwelll time? Very interested in this

orggrwr · Feb 27, 2026

Found them.

orggrwr · Feb 27, 2026

I just cut that limb off and cut away all rot i could see down to healthy tissue. Then it wet a paper towel with hydrogen peroxide and wiped the area down twice a day for 3 days. Luckily it didn't come back. And i agree the black plastic probably had something to do with it. Good Luck

Phyto · Feb 28, 2026

I've dealt with stem rot before, and used H2O2 dabbed on and around the affected area, you may have to do it more than once and it will often appear somewhere else on the plant, so be vigillant. If if completely encircles the stem, it's a goner.

trygrowup · Feb 28, 2026

@Rdub How is your air circulation?

Rdub · Feb 28, 2026

trygrowup said:
@Rdub How is your air circulation?

It’s good I have extraction fan and 2 6 inch fans running one above and one below the plants

bradpitt · Mar 21, 2026

Rdub said:
Hey all been growing in build a soil style organic beds for awhile now and never seen this. I lost a fairly sizable branch to it already. There’s little black bugs near the affected areas,( might be un related ) that are too small to reasonably get a good picture of. Any ideas? At first I thought it was rot from staying to wet around the base but now the little bugs got me worried

Personally, I wouldn’t ignore this—it’s not just cosmetic. Once it hits the main stem like that, it can spread fast if conditions don’t change.

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Growing in organic soil and never seen this

Growing in organic soil and never seen this

Rdub

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