17 apple, 5 pear, 4 peach, 3 pluot, plus 6 potted apples.
I try to keep them somewhat together as a species, except apples, they are in two distinct locations. Stuff like pears, peaches and pluots are together, and of course berry species are together (strawbs, rasps, goose, blues); most of the blackberries are on one row.
Spacing for apples is 12ft for dwarfs, 15ft for everything else. Peaches and pluots about 18ft, and pears about 15-20ft. For raspberries, I gave them about 3ft, blacks about 6ft, blues 8ft.
I also generally tried to plant my trees and berries in rows north to south to help them get the best sun exposure. Trees are separated far enough apart that I can get my riding mower in between them. In some cases, I can manuever my tractor in between them.
In some areas, I think the apples are too far apart, I expected them to fill in their spaces, but they haven’t. Think that has to do more with soil quality and tree shaping.
To my regret, I did a lot more research about how far each species and in a related way, rootstocks should be separated, but not enough research about the soil or nutrient requirements. I wish I’d spent more time to get my plots prepared before some of the trees were planted.
It sounds like a good idea to separate species to limit insect and disease concentrations, though. But, I put most of my species together to help with pollination.
We have 2 acres that are maintained by mowers, weedeaters, etc. But not all can be used for fruit, because some is taken up by garden plots and buildings (2 houses, big barn, corn crib, toolshed, chicken coop, pond, decrepit old cabin, even an outhouse (not used in 20 years!)). And most of the front yard is off limits, because of septic system and drain field.