I’m in central Illinois at the zone 5/6 border. I have scab and some cedar apple rust but no fireblight or powder mildew. But a local orchard has fireblight on susceptible cultivars. You will probably see these locally too.
One thing I should mention is diseases are just half the battle. Insects attacking the fruit is a major problem. Sometimes there is a honeymoon period for a few years and you don’t see them. But at some point they will show up. When they do you will need to bag the fruit or spray Surround or spray an insecticide.
Here is a organic spray schedule and a synthetic spray schedule