How much does it cost to deal with i think my ash tree has that beetle?

Treatment is priced by trunk diameter and recurs every few years, so compare the multi-decade total against removal rather than a single visit. Removing a live or recently killed ash prices like any tree its size. Removing an ash dead two or more years carries a real premium: brittleness rules out climbing and forces bucket or crane work plus a larger drop zone. The most expensive version of this problem is waiting — the same tree costs more dead than alive, and a crane setup for a backyard ash with no equipment access sits at the top of the range.