Our camp is mostly no-spray ..... except for bugs & caterpillars, which don't hammer all of our varieties.
I'm happy with the crabs and apple-crab crosses we've gotten from Blue Hill Nursery here in central Pa. Turning Point, Roadkill crab, Sweet November, Crabarina are all doing well for us. We've found that crabs seem to just do their thing without hassle every year. We have other crabs as well (mentioned above in post #9) - along with Chestnut crab (an earlier dropper in September here). I have no gripe with any of the apples & crabs I've mentioned here.
As for where to order trees from - I can recommend the ones our camp has ordered from below - happy with all of them. - - -
St. Lawrence Nursery (SLN). They graft their varieties on full-sized rootstocks, meaning you'll grow big, full-sized trees eventually - usually over 20 ft. tall, sometimes over 30 ft. They graft to either Antonovka, Dolgo, or Siberian rootstocks. SLN is in Potsdam, N.Y.
Blue Hill Nursery (BHN) is in central Pa. near Shamokin Dam. Ryan, the owner, grafts apples & crabs to full-sized rootstocks as well. Trees will get big and last for decades with care. I've been to Blue Hill in person. Nice operation, with a serious, dedicated owner.
Cummins Nursery is in Trumansburg, N.Y. We got a good number of trees from them over the years with no problems either. They graft to various rootstocks from dwarf, to semi-standard (80% of full-sized trees). The father of that family was the head of Cornell University's apple breeding program. They have sprawling orchards there - I've been to their place.
Adam's County Nursery (ACN) in south-central Pa. This is a premier fruit tree nursery that supplies many commercial orchards around the country. ACN is on Penn State's list of recommended fruit tree nurseries from all around the U.S. They do grow licensed, experimental fruit trees, testing for disease resistance, growth & taste characteristics, etc.
I would buy from any of those nurseries again, no problem.