comments..
The experts say Trailman is a cross of trail and osman. Trailman has not shown much CAR as of second leaf. My trail is first leaf. An old timer told me trail has been a very hardy tree in NW Mn.
Chestnut crab has been nearly disease free and tastes great. I have one in 30 leaf or so and several younger ones
Golden Hornet in 2nd leaf has been disease free.
Bill's redflesh (firecracker) has been disease free. Probably 5 th leaf.
I have a rootstock that I believe is columbia crab. It is in about 25th leaf. The apple size is bigger than what grin shows, but the shape is similar. disease free, very firm, inedible to people, a late hanger the deer love.
Lee pointed out the Nevis crab crosses to me several years ago. Nevis is the furthest north Ioensis crab that was found as of some time back in the 1930's. Nevis is a town in northern Mn. and near where I grew up. Wetonka is one of the Nevis crosses. I topworked about 6 of these crosses onto two different flowering crabs. One of these flowering crabs died. However some of the crosses were showing CAR. Somewhere, probably last summer, I had a post on what was showing CAR in my apples.
Don't forget dolgo and dolgo seedlings. Dolgo has been disease free and hardy. Variable drop time in seedlimgs.