Diseases Keep plants healthy. Rotate vegetable plants and sites. Space vegetables further apart to allow more air flow. Plant to take advantage of the prevailing winds so air flow is increased down the row. Don't go into the garden when plants are still wet.
Sanitation is important.
Remove and destroy all parts of dead plants. They are a source of disease. When thinning, remove thinned plants immediately. Don't harvest vegetables when plants are wet. Avoid overhead watering.