Short answer…Easy one!! The Wedgle makes injections through the bark without drilling and without damaging the sapwood. The chemical is injected into the cambial zone where the tree can easily use it. We are the first and only no-drill tree trunk-injection method. Injections requiring drilling can damage the sapwood, disrupt nutrient movement and cause permanent damage. And drilled holes allow pest and disease entry. In addition to hardwood trees, the Wedgle treats conifers and palms. For more information, click here.