Those pics do look like fireblight and tip die back from winter to me. I lost a zone 4 pear this winter and temps here didn't exceed zone 4 lows...I'm thinking fall drought going into winter has something to do with it
Drought might be part of it. I do not usually water my trees after 3rd leaf.
It still seems like I ran a few degrees colder than you on many mornings and the maps tend to show me closer to zone 3.
Nice lookin in deed sanbox. Yeh I'm in W MI on sandy land and the heat is here now and I always have problem w/ horse flies. They swam like crazy and they hurt something fierce when they bite. Working in the garden on Sunday I got whacked by one, so yep all those pests are now out until it cools again in October.
That dolgo in the picture is grafted and on antonovka. Across the ditch where we jumped that buck a few years ago. I wish it were closer to the house for easier picking. But I do have another grafted dolgo by the house.
None of my seedling dolgos or purchased dolgo seedlings from the SWCD have produced yet. I imagine it will not be too many more years until they do produce.