The fire blight season is in full swing now so keep a close eye on your trees. I will attach an article from University of Kentucky and a good article about the approved use of antibiotics in fighting this disease. If you have Michael Phillips book, The Holistic Orchard, he has a discussion on this topic as well.
I will also provide a list of disease resistant apples for our area. This is a combined list from Ohio, Indiana and Kentucky.
Disease Resistant Apples for Ohio, Indiana and Kentucky
Ashmead’s Kernel (ML)
Northern Spy (ML)
Turley Winesap (ML)
(the ones listed with (ML) have done well at Hayfields)