Cultural control usually involves any treatment which hastens stem maturation and discourages pathogen development. Home gardeners and commercial growers alike are advised to use a commercially prepared soilless growing mix that is sold in 3-4 cu ft. bales or bags. Remember, your soil is only as clean as the dirtiest surface that it has come into contact. Plant seeds shallow and in warm soil. Use soil mixes that drain well.
Excess nitrogen promotes seedling growth and succulence rather than maturation.
The fungicide should help kill pathogens in the immediate vicinity of the seed for approximately two weeks. Chemically treated seeds, however, are no substitute for the preventative measures discussed here. Since many diseases may be seedborne, avoid saving seed unless specifically trained and equipped for seed production. Frequently inspect seedlings as they are growing. Once established, diseases can rapidly move through a greenhouse.