0 stars !!! i contacted the company to treat an Ash tree for Emerald ash borers. My fault for not asking if Mr. Riggs was a Certified Arborist. He is NOT. FIRST RED FLAG. At first meeting, he could not tell me the name of the chemical was that he using. I hired him anyway. SECOND RED FLAG. He proceed to treat the tree incorrectly (according to 2 Certified Arborists that I contacted, and the Arborjet website). He injected a LARGE amount of air into the tree's vascular system (which causes air emboli), used the wrong amount of chemical, and drilled the holes incorrectly. i asked him to leave before he could finish. Only time will tell if my tree will suffer damage. I hired a Certified Arborist, who did everything correctly. read more