We believe our oak trees have Oak Wilt. How do we determine this and what can...

Asked June 7, 2014, 11:04 AM EDT

We believe our oak trees have Oak Wilt. How do we determine this and what can be done?

Anoka County Minnesota

1 Response

I am sorry that your oak has oak wilt. It is best to hire a certified arborist as soon as possible so it does not spread to other oak trees. It spreads by root grafts and insects. He has the education and experience to identify the disease and possible remove large trees. http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/how-to-hire-a-professional-arborist/ http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/removing-trees-and-shrubs/ You can identify oak wilt by the leaves and the vascular tissue. If you cut off an affected oak wilt branch the outer ring of springwood vessels will be plugged with brown material (tyloses and gums). Sometimes oak anthracnose is mistakenlythought to be oak wilt This is how you differentiate the two diseases. http://www.extension.umn.edu/garden/diagnose/plant/deciduous/oak/leavesbrownspots.html You can send a sample to the plant disease clinic. http://pdc.umn.edu/ http://www.extension.umn.edu/garden/diagnose/plant/deciduous/oak/leavesbrownedges.html