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Prevent Dutch Elm Disease by Injecting Your Elm

Since 1995, we have injected thousands of trees with an annual success rate of over 99%.

Preventive systemic fungicide injections are our most useful tool in preventing Dutch elm disease(DED). We have developed an intensive DED management program that is second to none.

Elm Tree Preparing the Site

Site inspection

Before doing any work, our arborists carefully examine the tree for any signs of DED. Any symptomatic or suspicious areas are relayed to the client before the injection if the terms of the warranty change. This is extremely important as DED can move very rapidly in some cases. It also points to the value of experienced, certified applicators, not seasonal help. Our most experienced applicator, Craig Thiedich has injected well over a thousand elms since 1995.

Root Flare Excavation Exposed Root Flare

Site Preparation

Excavating the root flare of a tree is essential for an effective elm injection. First, it is the least damaging area to inject a tree because cells in the root flare are better able to compartmentalize and recover from damage. Secondly, excavating allows for more surface area for injection sites helping to get uniform distribution of propiconazole and decreasing the risk of a phytotoxic reaction. Excavating also allows us to assess the health of the root flare. We have found that some of our past failures were linked to trees with damaged root flares from construction or root rot. If an excavated root flare shows severe damage, this information is also relayed to the client prior to the injection.


Drilling Injection Sites Attaching Tubing

Injection Site Placement

Research has shown that the optimum number of injection sites is 2.25 per diameter inch at breast height. Fewer sites and you may not get even distribution, too many and you’re doing unnecessary harm. Through experience, our applicators know the proper quantity and placement of injection sites to ensure uniform distribution of the fungicide.

Injection Site Placement Injection Site Placement

Finishing the job

After the proper dosage of fungicide has been administered, it is very important to push the solution into the vascular system of the tree, away from the injection site. This is accomplished by chasing the fungicide solution with water, which limits cellular dieback near the injection site. Inspecting, excavating, and flushing with water add time to a job, but greatly increase the effectiveness of our elm treatments.

DED Treatment in-progress Monitoring the Injection


During the injection process and throughout the protection period, monitoring is critical for success. Monitoring an elm injection ensures proper delivery of the fungicide. Checking the appearance of elms within root graft distance (generally about 100 feet) is vital in determining the threat of a root graft infection to a treated tree. Subtle differences in appearance can be clues that an untreated tree may harbor a latent infection, which may pose a root graft risk to a treated tree. It is very important to remember that with regards to Dutch Elm disease, the earlier an infection is detected, the greater our chance for successful treatment. Therefore if you observe leaves dropping or changing color (not in the fall) do not hesitate to call it to our attention, someone is always available for inspections.



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Root Flare Injection














































Professional and Industry Links (Click on logos below)

Tree Care Industry Association
Minnesota Society of Arboriculture
International Society of Arboriculture
Minnesota Nursery and Landscape Association

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