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Understanding Dutch Elm Disease in Sacramento, California: Symptoms and Management Strategies

Dutch Elm Disease (DED) is a serious threat to elm trees in Sacramento, caused by a rapidly spreading fungus that invades the water-conducting system, leading to water restriction, progressive wilt, die-back, and eventual tree death. Symptoms include wilting, leaf curl, dry brown leaves, yellowing, and premature leaf drop. The disease spreads through the European Bark Beetle and root grafting with infected trees. Efforts in Sacramento include monitoring, removal of infected elms, and planting resistant varieties. Learn more about prevention and management strategies.

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Understanding Dutch Elm Disease in Sacramento, California: Symptoms and Management Strategies

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  1. Dutch Elm Disease SacramentoCalifornia in

  2. What is Dutch Elm Disease (DED)? • DED is caused by a rapidly spreading fungus • Invades water conducting system • Restricts water movement • Causing progressive wilt, die back and eventual death

  3. DED Symptoms • Wilting of leaves • Leaf Curl • Dry, brown leaves • Occasional leaf yellowing • Premature leaf drop • Discolored wood

  4. Not DED Symptoms • Squirrel damage • Broken limb • Cambium layer chewed likely by squirrels

  5. How the disease spreads! • European Bark Beetle (Scolytus multistriatus) • Through root systems grafting to a neighboring tree with DED

  6. Not European Bark Beetle (= Pyrrhalta) • Elm Leaf Beetle (Xanthogaleruca luteola) • Defoliates trees but does not carry the fungus which spreads DED Depicts medium ELB damage

  7. Elm Leaf Beetle (ELB) Damage Light: = 0-10% Medium: = 20% - 40% Heavy: 50% - 70% Very heavy: 80% -100%

  8. Identifying mature elms Leaf Bark

  9. Annual Inspection Professionals Trained volunteers

  10. What are we doing? • Monitoring all elms for DED • Removing hazardous and infected elms • Planting DED resistant elms • Monitoring DED resistant elms progress • Educating and reaching out to the community

  11. DED Resistant Elms • Ulmus carpinifolia x parvifolia ‘Frontier’ • Ulmus glabra x carpinifolia x pumila ‘Homestead’ • Ulmus americana ‘Princeton’ • Ulmus americana ‘Valley Forge’ • Ulmus carpinifolia x glabra ‘Pioneer’ • Ulmus japonica x wilsoniana ‘Accolade’ • Ulmus wilsoniana ‘Prospector’

  12. Ulmus carpinifolia x parvifolia ‘Frontier’ 3705 4th Avenue

  13. Ulmus glabra x carpinifolia x pumila ‘Homestead’ 4533 T Street

  14. Ulmus americana ‘Princeton’ 5412 T Street (tree in forefront)

  15. Ulmus americana ‘Valley Forge’ William Land Park (on golf course, by pond off of 14th Avenue)

  16. Ulmus carpinifolia x glabra ‘Pioneer’ 4648 T Street

  17. Ulmus japonica x wilsoniana ‘Accolade’ 5417 T Street

  18. Ulmus wilsoniana ‘Prospector’ 310 11th Street

  19. What can we do? For further information contact: Sacramento Tree Foundation Web: www.sactree.com Phone: 916-924-8733 Plant for the… …future!

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