TreeResearch.org: Tree Trunk Injections Without Drilling are Preferred Over Spraying and Soil Treatments

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Tree trunk injections without drilling are being used more frequently as people become concerned about the effect of pesticides on the environment. Trunk injections are considered more environmentally friendly because spraying and soil treatments release chemicals into the environment.

Tree trunk injections without drilling are being used more frequently as people become concerned about the effect of pesticides on the environment according to the Integrated Pest Management (IPM) of Midwest Landscapes manual.

"Because spraying and soil treatments release chemicals into the environment, trunk injections are probably considered to be more environmentally friendly," according to Dr. Dave Roberts, specialist and district horticulture agent with Michigan State University Extension as published in the Plant Doctor's Landscape Tips from the January 2009 Landsculptor magazine. Roberts, who first identified Emerald Ash Borer in the United States in 2002, is also featured in the "Saving Trees from EAB" video on YouTube and http://www.treeresearch.org.

The IPM Tactics and Tools section explains the advantages of injection over spray and soil treatments. Injections use much less material and the equipment needed to apply it is much simpler. Insecticide can be applied in windy and rainy weather, and putting the chemical directly into the tree keeps it away from people, wildlife and other non-target insects.

"Some injection procedures also cause wounding to the tree," according to Roberts. Most tree injections require holes to be drilled into the bark and wood which can cause a disruption in the tree's water conducting system and injure the tree. These injuries can be significant, or they may have little effect on the tree depending on the method used, the material injected and the tree's overall health. Small and shallow holes are recommended to limit damage and allow the tree to recover more quickly. An alternative to drilling is the ArborSystems' Wedgle Direct-Inject system, which uses a needle that is pushed through the bark. It is the only trunk injection method that does not require drilling and can treat most trees in five minutes or less.

Injections should be applied beneath the bark and into the tree's water conducting system in the outermost one or two rings. This allows the insecticide to move upward with the flow of sap and become concentrated in the leaves and shoots. If a hole is drilled too deep, the injection will push some of the insecticide into the inner rings where it will stay and not be used.

TreeResearch.org was created for homeowners, commercial property owners and municipalities to show the successful control and treatment of Emerald Ash Borer. It features real life examples of the most efficient remedy and procedure for healing and saving Ash trees rather than destroying or cutting them down. For more information, visit http://www.TreeResearch.org .

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