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Damping off - Hardening off - Paul Fowler
SECTION 3 - HARDENING OFF
DAMPING OFF
‘Damping off is the term used to describe the process of wilting that occurs if the seedling/cutting has been effected by a virus, fungus, pathogen or bacterial disease.

The risk of damping off occurring can be minimised by ensuring that all of your equipment is clean and sterile before use.

There are several types of damping off:

Pre-emergence damping off.
The seed may rot before emerging from the Rockwool/rooting medium.

Post emergence damping off.
The seed may emerge and then die.

Wire stem damping off.
The seed/cutting may remain alive but be stunted. The stem will then damp off and the plant will eventually die.

Root rot.
The roots of the young seedling/cutting may be attacked, which will stunt the plants growth before it dies.

As the ideal conditions for propagation are also the ideal conditions for bacteria etc to develop, damping off is something you should always look out for. Damping off is usually the result of one or more of the following factors:

  • Unsterile equipment.
  • Over watering or insufficient drainage.
  • Poor cut caused by blunt instrument.
  • Insufficient ventilation.
  • Damage to the root or stem.
  • Plants are too densely planted.
If signs of damping off are noticed early enough, then treatment with a good fungicide will stop it progressing and allow the plant to develop normally. However, also check the above, as if you do not treat the cause as well as the symptom the problem will probably recur.

<< Section 3 - Some common problemsSection 3 - Notes and labelling >>