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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.
Woody Plants:
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)
10. Tree decline syndrome (maple especially)
Herbaceous plants:
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)
Turfgrass:
General: See Cornell Gardening Resources Common lawn diseases.
1. Rust
2. Pink patch/red thread
3. Brown patch
4. Snow mold
5. Fairy rings
More turf disease factsheets.
Oddballs:
1. Sooty mold (lots of plants)
2. Slime mold (mulch)
3. Sphaerobolus spore packets (everywhere)
4. Damping off (seedlings)
© Copyright, Department of Horticulture, Cornell University.
Website design: Craig Cramer cdc25@cornell.edu
Mention of trade names and commercial products is for educational purposes; no discrimination is intended and no endorsement by Cornell Cooperative Extension or Cornell University is implied. Pesticide recommendations are for informational purposes only and manufacturers' recommendations change. Read the manufacturers' instructions carefully before use. Cornell Cooperative Extension and Cornell University assumes no responsibility for the use of any pesticide or chemicals. Some of the links provided are not maintained by Cornell Cooperative Extension and Cornell University. Cornell Cooperative Extension and Cornell University are not responsible for information on these websites. They are included for information purposes only and no endorsement by Cornell Cooperative Extension or Cornell University is implied. Cornell Cooperative Extension provides equal program and employment opportunities.
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