Northeast

• New York. Disease Factsheets of Trees and Shrubs (Plant Disease Diagnostic Clinic, Cornell University)

• Pennsylvania. Woody Ornamentals Diseases (Department of Plant Pathology, Penn State Cooperative Extension) fact sheets

North Central

• Minnesota. Plant Disease Diagnostics (University of Minnesota Extension) is a visual guide to identifying plants problems. Click on "Trees" or "Shrubs and Vines" for help finding tree and shrub disease information.

• Wisconsin. Deciduous Trees & Shrubs: Diseases (University of Wisconsin Extension) is a listing of fact sheets.

• Wisconsin. Deciduous Trees & Shrubs: Miscellaneous Disorders (University of Wisconsin Extension) is a listing of fact sheets.

• Wisconsin. Evergreens: Diseases (University of Wisconsin Extension) is a listing of fact sheets.

West

• California. Pests in Gardens and Landscapes—Landscape Plants (University of California Statewide IPM Program) can be used to find diseases and other problems by clicking on the plant affected.

• Washington. HortSense (Washington State University)

   -:User hint: Click on type of plant to learn about possible disease problems.

South

• USDA - Southern Region. Diseases of the Southern Region is a resource for the southern US.

• North Carolina. Ornamentals Disease Information Notes

• Tennessee. Disease of Shade and Ornamental Trees (University of Tennessee Agricultural Extension Service). PDF file, 6 pages.