If you use a sprinkler, do it early in the day so the leaves will dry by nightfall.
Reduce the likelihood of fungal diseases by watering the soil, not the leaves of the plants. If you use a sprinkler, do it early in the day so the leaves will dry by nightfall. If a plant falls prey to a disease, promptly remove it and throw it in the trash; don't add sick plants to your compost pile. Additional disease preventatives include growing vegetable varieties listed as disease-resistant and changing the location of your plants each year (crop rotation) to reduce disease-causing microbes from building up their populations.