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22 lip 2022 · Native elm wilt is caused by the fungus Dothiorella ulmi. While all elm species are susceptible to native elm wilt, the disease has most often been observed in cedar elms. McBride said the Dothiorella ulmi pathogen becomes more prevalent during extreme environmental conditions, including drought.
Elm. Ulmus spp. Black Leaf Spot (fungus – Gnomonia ulmea): Small, yellow spots appear first on upper surface of leaves, then gradually develop a shiny black appearance. Heavy spotting causes leaf yellowing and early defoliation in wet seasons.
Figure 1. An American elm exhibiting symptoms of infec-tion by the Dutch elm disease pathogen, Ophiostoma novo-ulmi. Source: Steven Katovich, Bugwood.org. More rarely, DED has been detected in cedar elm, but that species is considered to be the most resistant of the native elms to the disease.
13 kwi 2023 · Here are common signs and symptoms of Dutch Elm Disease and how to properly dispose of a tree with Dutch elm disease.
19 kwi 2024 · Maintaining the health of American Elm trees requires vigilance in identifying and treating common diseases promptly. Regular inspections, proper cultural practices, and timely interventions can help protect these iconic trees from succumbing to deadly pathogens.
22 paź 2021 · Although elms are among the most highly prized of all shade trees, they are susceptible to some serious wilt diseases, including Dutch elm disease (DED), the most damaging disease of urban trees in North America, and native elm wilt.
A different disease has been diagnosed in Texas on cedar elm, called native elm wilt. This disease is caused by the fungus Dothierella spp. and without laboratory confirmation may be confused with Dutch elm disease. Bacterial leaf scorch (BLS), caused by Xylella fastidiosa,
