I just cut down my apple tree, the only one in our yard, because it succumbed to fire blight. We live in Oklahoma, and the past 3 years, we've had a lot of rain in our area. I've heard we've had 13 inches the past month. We have a small yard, and I only have room for two trees (we have a white peach that is delicious, so that takes up one), but I'm looking for something that is resistant to cedar apple rust and fire blight. The tree also needs to be self-fertile. I've look at charts for disease susceptibility and then checked if they were self-pollinating, but I've not found the magic combination. I presume I need to wait a while before I can plant another apple tree in our back yard, but does anyone know how long I need to wait? Would this fall or spring be too early? Thank you.