Not having any other fields around, will definitely keep your diseases down. Consider yourself spoiled!
Dunno about the value of unsprayed but not Organic Cert., If the others are getting the same price, it's likely due to the dearth of fresh fruit and a much less competitive market. Enjoy it, and expand on it!!
With expanding, and bringing in plants from outside, you might consider looking into a good systemic fungicide this fall though.
Even "Certified" plants bring ugly stuff with them, and it can be devastating. Been there, and it's maddening.
Pristine in the early fall, and then Sulforix at 1gal per A, or plain old Lime sulfur before bud break the following spring, cleans things up nicely if you suspect any crud has creeped in.
I wont even let other people drive out into my field. I don't know what kind of crud they are bringing with them.
Fungicides are expensive, and getting rid of bad outbreaks can kill a seasons budget quick. You're really blessed with the isolation aspect.
Bob T?
He's still the the Small fruit guy over there AFAIK, and should still be covering Blues.
See if he can hook you up with SWD traps, or show you how to make them, and walk you through identifying the flys.
They thrive in the wild blackberry's, and every other soft skinned fruit, and will jump on Blueberry's in a heartbeat.
Our season was cut short last year because of the things, and nobody wants to eat maggots. Just another nasty invasive unfortunately.
Have you linked into the Blueberry alerts?
Michigan Blueberry Facts
Reviving old Bushes can be nerve wracking if done piecemeal.
Most guys just use the bush hog and take them all the way down, then snip all but 3-4 of the new canes in the spring.
Folks that don't know or understand, immediately start spreading rumors if they see one of us chopping away, and it's always fun to hear that we "Went off the deep end".
If ya get over to this side of the state, holler.
I'll give ya the 50 cent tour, and see if I can't get you a tour of a couple other operations.