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Disease-resistance abbreviations like A and DM indicate that a plant is resistant to anthracnose and downy mildew respectively, crucial information if your garden has had issues with these.

Maples are prone to many diseases, such as anthracnose, verticillium wilt, and powdery mildew, but I am still confused, so I call Brian Crooks, a forester with the Western Pennsylvania Conservancy.

Not all diseases can infect seed, but some can — including anthracnose fruit rot and early blight, as well as some bacterial diseases.

Although many fruit issues are abiotic — caused not by disease, but by disorders that result from stressors like nutrient imbalances, poor soil conditions and uneven watering — anthracnose fruit rot is an exception.

No hand lens is required to diagnose anthracnose, or the most common abiotic disorders.