Vegetable Gardening - Handbook for Beginners
Chapter 3.5.
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Disease pathogens are naturally always present in the air and soil. These pathogens become problematic only when all elements of the pest triangle are present. To avoid this, make sure your garden environment does not encourage favorable conditions for disease by collecting and destroying all leaves affected by diseases and fungus, such as peach-leaf curl, roses with blackspot, squash with powdery mildew, and hollyhocks with rust. Do not compost these leaves or use them as mulch, as this will spread the diseases.
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