Dutch Elm Disease

Dutch Elm Disease (DED) has been devastating Elm trees in Minnesota for years. Through the years we have learned a lot about preventing a DED infection.

How long will my tree be safe?
The fungicide protects the tree for 3 growing seasons, at which time the tree grows beyond the chemical and it is no longer effective. In recent years the number of infected elm trees found throughout the Twin Cities has been enormously higher than in the past. This has lead some cities and home owners to have their high value elms treated every 2 years for absolute certainty.

Is there a cure for Dutch elm disease?
Probably not. However, if it is caught early enough and specific strategies are taken, it is possible to save a tree.

Are my elms at risk if there is an infection nearby?
YES! The disease can spread through the root system if they are close enough to one another. Most outbreaks however, start from elm bark beetles carrying DED fungal spores from infected elm trees to healthy ones.

Dutch Elm Disease (DED) has been devastating Elm trees in Minnesota for years. Through the years we have learned a lot about preventing a DED infection Most cities require immediate removal and disposal of infected elm trees. With large trees in small areas, the removal costs alone can be in the thousands of dollars. Protection against DED can be a more enjoyable and financially practical way to manage your elm tree.

What is the procedure?
Small holes are drilled into the tree’s vascular tissue at the tree’s root flare slightly below the soil, approximately 2.5 holes per 1” DBH. Tubing from a pressurized tank with the fungicide solution is then connected to all the holes in the tree. Through the process of transpiration the solution is taken into the trees vascular system and spreads throughout the canopy. This will protect the tree from DED brought to it via an infected elm bark beetle.

What chemical does PTP use?
PTP uses a systemic fungicide with propiconazole 14.3% as the active ingredient. This fungicide formulation causes much less decay around the injection sites than other chemicals, allowing this process to be successfully repeated every 2-3 years. PTP has an extremely high success rate against Dutch elm disease when the process is administered to good candidate trees.

U of M: History of DED Alternative Elm Story: Injection with Propiconazole National Forest Service: Chemical Info

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