Disease fungi take their energy from the plants on which they live. They are responsible for a great deal of damage and are characterized by wilting, scabs, moldy coatings, rusts, blotches and rotted tissue. This page is designed to help identify some of the more common plant diseases and provides earth-friendly solutions (see organic fungicides) for combating them. Click on the links or pictures below to learn more.
Scabby spots on fruits and leaves are sunken and may have velvety spores in the center.
Common on cherries, peaches and plums, but may also affect other kinds of stone fruits.
Ripening tomato and pepper fruits develop a large, sunken, leathery spot on the bottom end.
Look for pale yellow, pinhead sized spots on the upper surface of the leaves shortly after bloom.
Galls can grow up to 5 inches in diameter and release thousands of spores as they rupture.
Occurs when old seed is planted in cold, wet soil and is further increased by poor drainage.
Appears as a dusty white to gray coating over leaf surfaces and other infected plant parts.
Found on potato and tomato leaves as pale green spots, often beginning at leaf tips or edges.
Leaves have dark water-soaked spots, sometimes with a yellow halo, usually uniform in size.
Affects the blossoms, fruit, leaves and shoots of backyard peach and nectarine trees.
A common tuber disease that shows as dark, pithy patches that may be raised and “warty.”
Reddish-orange spore masses are found primarily on the surface of lower leaves.
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