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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 for combatting them. Click on the links or pictures below to learn more.
Generally found in the eastern part of the U.S., anthracnose infected plants develop dark lesions on stems, leaves or fruit.
Symptoms on fruit are similar to those found on leaves. Scabby spots are sunken and may have velvety spores in the center.
Infection causes sunken, oozing cankers to form on many stone fruits. May cause wilting or death of branches or trees.
Infected plants have brown or black water-soaked spots on the foliage, sometimes with a yellow halo, usually uniform in size.
A serious disorder of tomato, pepper and eggplant, blossom end rot is caused by low levels of calcium when fruits are forming.
A major disease of stone fruits, brown rot can cause huge losses in peaches, cherries, plums, prunes, nectarines and apricots.
On apple and crabapple, look for pale yellow pinhead sized spots on the upper surface of the leaves shortly after bloom.
Infected plants in the cabbage family will have misshapen and deformed (clubbed) roots, often cracking and rotting.
Most often found on mature plants where symptoms appear primarily on the surfaces of lower leaves.
Corn galls can grow up to 5 inches in diameter and release thousands of spores as they burst or rupture.
A common disease of many woody shrubs and some herbaceous plants, including grapes, stone fruits and roses.
A result of soil borne fungi, damping-off usually refers to the disintegration of stems and roots at and below the soil line.
Spore production is favored by temperatures cooler than 65 degrees F. and by relative humidities approaching 100%.
Appears on lower, older leaves as small brown spots with concentric rings that form a “bull’s eye” pattern.
Named for the scorched appearance of infected plant leaves, fire blight is a destructive bacterial disease.
Fusarium wilt initially causes a yellowing and wilting of lower leaves, especially in tomato and potato plants.
Gray mold is identified as grayish colored soft, mushy spots on leaves, stems, flowers and on produce.
Symptoms appears on potato or tomato leaves as pale green to gray spots, often beginning at leaf tips or edges.
Disease fungi overwinter as spores (conidia) underneath bark, around buds and in other protected garden areas.
Leaves of infected plants are characterized by intermingled patches of normal and light green or yellowish colors.
A common tuber disease that occurs wherever potatoes are grown. Scab spots appear as brown, roughened areas.
Powdery mildew appears as a dusty white to gray coating over leaf surfaces and other infected plant parts.
A persistent soil borne disease affecting fruits and vegetables, especially tomatoes, potatoes, peppers and eggplant.
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