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Pest & Disease Library · Solutions

Damping-Off Control in Tomato Seedlings

Damping-off (Pythium, Rhizoctonia, Fusarium) kills tomato seedlings at or just after emergence, collapsing stems at the soil line. Cold, wet, over-sown media and poor sanitation drive it, and losses can wipe out a tray overnight.

Common crops affected

Why it matters

It can wipe out a tray or seedbed quickly and survivors are stunted; prevention beats rescue, since the pathogens live in soil and reused containers.

When to act

Protect at sowing and early establishment with clean media and controlled moisture.

What to look for

  • Seeds failing to emerge (pre-emergence rot)
  • Water-soaked, pinched stems at the soil line
  • Toppled seedlings that don’t recover
  • Patchy stands across trays

How to manage it

  1. Use clean media and sanitised trays; water carefully; give airflow.
  2. Apply Spore Control as a protective drench; build soil biology with Charge Bioboost.

Recommended Vegalab program

A Vegalab soil/seedling solution plus sanitation and moisture control — see the Product Finder for the registered option.

RoleProductUse
Primary controlSpore ControlProtects germinating seedlings
Soil biologyCharge BioboostSuppressive soil biology
RootsRoot BoostStrong early roots

Product claims, rates, and availability vary by jurisdiction; always follow the applicable label.

Frequently asked questions

How do I prevent it?

Clean media and trays, avoid overwatering and cold wet conditions, and treat at sowing.