Seeds germinate and grow most successfully in warm, moist conditions; however, these unfortunately are precisely the same conditions that encourage the development of fungal diseases.

Reducing the Risk

To reduce the risk of exposing young plants to infection, it is essential to make sure that all propagating equipment is kept clean and sterilised. Seed trays and propagators should be sterilised before use, and compost should always be fresh and sterile. Tools and benches should be wiped down periodically with a mild disinfectant and all fallen leaves or other debris removed immediately.

Damping Off

Seedlings may also be at risk from fungal diseases if they become too moist or overcrowded. This is known as 'damping off', where the roots darken and die and the seedling collapses. This disease can be avoided by maintaining the correct moisture levels, pricking out the seedlings to stop them from becoming overcrowded, and ensuring that there is an adequate air flow above and around the plants.