Rainbow Tree Care

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Dutch Elm Disease and Oak Wilt In Minnesota

Rainbow Treecare has again started to see symptoms of these two deadly diseases in the Twin Cities. Elms and oaks are two of our most highly prized shade trees, by monitoring them closely we can make sure they will be around for generations yet to come. Preventive treatment is the most effective way to protect your trees.
Dutch Elm Disease
Dutch elm disease (DED) is caused by an aggressive fungus that kills elms regardless of their health. This disease kills thousands of elms in our communities each year and will remain active as long as there are susceptible elm trees.
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This is a lethal disease that invades and disables the water-conducting system in oaks. Red oaks typically die within 4-6 weeks of initial symptom development, while white oaks may survive or take 1-6 months to defoliate and die.

Oak wilt disease symptoms and treatments
Identify and evaluate the trees you have in your landscape. There are many valuable landscape trees at risk from devastating exotic insects and diseases. Determine if your trees are of value for protection, if unsure contact your arborist for help. Vulnerable tree species to consider are:

Emerald Ash Borer
The Emerald Ash Borer (EAB) has killed millions of ash trees since its discovery in southeastern Michigan in 2002. Through a combination of natural spread and human activity it is now found in Michigan, Ohio, Indiana, Illinois, Missouri, Pennsylvania, Maryland, West Virginia, Virginia, Wisconsin, and now Minnesota, placing millions of additional ash trees at risk.

Dealing With Dead And Dying Ash Trees
Hundreds of thousands of ash trees will be removed as a result of the Emerald Ash Borer, an invasive beetle that kills all native ash trees. Although some valuable trees can and will be saved it leaves us with a dilemma regarding what to do with all the removed trees.