I wouldn’t recommend using Imidan in a small backyard planting. It’s an organophosphate and has a fair amount of toxicity to mammals (including people). If your using it be especially careful when doing the initial mixing since it’s much more concentrated before you mix it in the water.
I would recommend going to Sevin. The new formulation of Sevin has Zeta-Cypermethrin as the active ingredient. It’s fairly effective and has much less toxicity to people and mammals.
I would take a look at Alan’s spray guide it has quite a bit of useful info and it’s a good place to start.
I think apples are going to be doable in Tennessee. Peaches and plums are going to be more challenging primarily due to brown rot. Captan and Indar are pretty effective against brown rot. I should point out that Captan needs to be mixed into acidic water or it will decompose quickly.
Hopefully, @thecityman will comment on this thread. He is in Tennessee too and is growing stone fruits like sweet cherries and peaches so his local experiences would be very helpful to you.