Tree borer control in Maryland
I have many borer holes in the trunk of my tree. I am located in Pikesville, just outside Baltimore. I am aware that imidacloprid is banned in Maryland. How can I save the tree. It is still very much alive, and all I see are the holes, I have not seen the insects, nor do I see sap. What to do. I am enclosing some pictures. Thank you for your help.
Your tree is showing signs of sapsucker damage. These birds feed on sap and the insects entrapped by the sap. You can wrap barriers of 1/4 inch hardware cloth, plastic mesh, or burlap around injured areas to discourage further damage from feeding. This method may be practical for high value ornamental or shade trees.