“Deep injection holes into trees that form tyloses makes no sense,” according to “Modern Arboriculture,” Alex Shigo’s reference text that is recommended by the International Society of Arboriculture. Tyloses is a sap like compound that forms in response to wounding and plug the damaged growth rings so they can no longer conduct water and nutrients. Holes drilled according to specifications also can cause problems by allowing air into the vascular system which can disrupt water and nutrient movement and provide entry points for pests and disease. Shallow injections allow the insecticide to move upward with the flow of sap through the vascular system. ArborSystems’ “Wedgle” Direct-Inject Tree Treatment System is designed to distribute the chemical into this outer active layer of the tree. For more information, click here.