Yes, Elm Bark Beetle tracks. The bark beetles carry DED on themselves and inoculate the trees with the disease. The bark beetles by themselves shouldn't severely damage a tree.

So the sapsucker was going for them? Maybe I should not plant replacement Elms.

My understanding is that Sapsuckers are just that...they don't bore holes looking for insects but will eat insects caught in the sap.

Other bark beetles utilize already dead trees also. To help ID, it depends on which direction producing mother etches line out where offspring exit. I think that's one difference between native beetle and European Elm bark beetle. DED Disease is supposed to be able to survive several years living in infected roots. Since neighboring healthy elms are vulnerable for several years after diseased elm cut down. But I never heard of newly planted elm succumbing to root contained DED, probably because no one plants another vulnerable elm species. But DED is not like Verticillium wilt that can sit dormant for ten or more years in soil. Now Ash killed off from EAB have no facts in common with diseased elms. Except for that EAB is also a phloem bark beetle, but only attacks live trees. As breeding elm bark beetles utilize dead trees, which continue to be dangerous until bark sluffs off within two years. EAB does not infect or disease trees like DED, So as long as Ash wood is chipped under one inch of size, one can use as mulch.