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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.
Continue reading about
Dutch elm disease symptoms and treatments
Oak Wilt
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.
Continue reading about
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:
- Ash - Emerald Ash Borer prevention
- Elm - Dutch Elm Disease prevention
- Oak - Oak Wilt prevention
- Deciduous Trees & Shrubs - Japanese Beetle management
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.
Trees seem sad? Give 'em water
We fuss over the garden and pick dandelions out of our lawns. Big trees? They seem as eternal as the sky and the water.
So people ignore mature maples, oaks and birches until, alarmed at dying branches and thinning canopies, they call someone like John Lloyd, director of research and science for Rainbow Tree Care.
These days, Lloyd usually tells people they don't need an insecticide. They don't need to fertilize. They need to water -- today, next week and often.
Read the full story at 
Watch Rainbow Treecare In Action
A video created by a client while Rainbow worked on his trees.
