There is no effective control unfortunately once the disease has become established. The disease is best prevented by sowing seeds thinly, providing good ventilation, maintaining strict hygiene, and by not over watering. If possible use a sterile soil mix. If you follow these simple rules, you should have no problem with the dreaded and frustrating damping off diseases. It can be extremely frustrating when seeds do not germinate.
Some seeds are unable to germinate immediately because of their physiological makeup.
Others germinate very readily if provided with the proper environment. As seeds ripen in the fruit, they begin to lose moisture, and when fully ripe they enter a period of dormancy during which no germination will occur, even under ideal conditions. This dormancy lasts but a few days to many years. Therefore for seeds to germinate they must be viable, the appropriate external environmental conditions must be provided, and lastly, the seed must be physiologically ready to germinate. Seed dormancy may be caused by the embryo being immature or though mature, germination will not occur because of the external seed coat or dormancy may be controlled by the internal physiology of the seed or a combination of internal and external dormancy's may be responsible.