Above is an image from a chemical trial / field study showing the extent of impact from a small drill hole after just 4 months. It is incorrectly labeled as 'nicely compartmentalized'. The discolouration is a chemical reaction within the tree. After only 4 months, reaction is seen from the drill hole at the bottom red arrow to the top arrow. Over time decay can spread throughout a trunk reducing structural integrity. Tree age, water stress and other factors can increase the degree of damage as will ongoing defoliation by Elm Leaf Beetle. Treetec will undertake stem injection if there is not a more appropriate method available.