It sounds like internal damage to the tree, how long ago did you treat it? Pest control is best left to a professional. I liked the quality of Evans West Valley Spray's work, you can check them out at the link. they have qualified professionals working for them, as verified by ISA Tree Risk Assessment Qualification and ASCA. They first perform a complete tree diagnosis to determine further treatment and a rescue plan.

Hi all, yesterday I noticed that one of the trees was covered in a white patina and insects were crawling all over it. I'm afraid to use internet methods, I'd rather go to a specialist. Where did you order a tree risk assessment?