“In my part of the country fruit trees need to be sprayed for insects/parasites”
Probably the same everywhere. Around here, if a tree isn’t sprayed for insects, squirrels have a feast on the unwormy nuts.
As a one-time pecan orchard manager, I can assure you that, if these trees are not maintained properly -- and that means, at a minimum, fertilizing and spraying -- they will never produce any meaningful fruit. And the birds will get whatever there is before any humans do.
With some fruits, that means pruning and thinning, as well.
For example, has anybody ever found any edible fruit on a wild cherry tree? Or a wild hickory? In the woods, they're relatively common.
If Vancouver believes they're ever going to have "a crop", they're dreaming.
Ems good eatin, too...