‘All species of elm trees in Alberta are susceptible to DED,’ explains Janet Feddes-Calpas, executive director of STOPDED.
‘The disease can kill an elm within weeks of infection and is spread by the elm bark beetles. If a tree is infected with this fungus the tree must be removed and disposed of immediately to prevent further spread of the disease.’
She says to look for:
- flagging – leaves of one or more branches near the top of the tree may wilt, curl, turn yellow and then brown, remaining on the tree
- staining – an infected twig sample will have red streaks through the sapwood
Feddes-Calpas adds that DED is spreading west of Moose Jaw and moving closer to the Alberta-Saskatchewan border.
Elms suspected to have DED symptoms must be tested at a lab for the presence of the fungus. All samples taken in Alberta are processed free of cost at the Alberta Agriculture and Forestry Plant Heath Laboratory.
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