David Chinery, CCE Rensselaer County educator compiled this list for the Capital Region Master Gardener Volunteer training. We added the links to more information and pictures about these common plant diseases.
1. Apple scab (apple)
2. Apple-cedar rust (apple and juniper)
3. Anthracnose (dogwood, oak, maple, sycamore)
4. Bacterial crown gall (small euonymus)
5. Black knot of plum (plum, cherry)
6. Black spot of rose (rose)
7. Phytophthora wilt (rhododendron)
8. Powdery mildew (lilac)
9. Tar spot (maple)
1. Botrytis (peony)
2. Brown rot (fruits of grape, strawberry, etc.)
3. Blossom end rot (tomato)
4. Wilt (Clematis)
5. Early blight (tomato)
6. Leaf spots (many perennials, including Rudbeckia 'Goldsturm')
7. Necrotic spot virus (impatiens)
8. Powdery mildew (phlox, beebalm, cucurbits)
9. Rust (hollyhock)
10. Volutella blight (Pachysandra)
General: See Cornell Gardening Resources Common lawn diseases.
Anthracnose on Turfgrass
More turf disease factsheets.
Slime mold (mulch)
Sphaerobolus spore packets (everywhere)
4. Damping off (seedlings)
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