If my body no longer contains the cough medicine I was given at 10 years old, I don’t expect a grown tree to retain the spray from the original cutting it grew from; it would’ve long been metabolized and/or eliminated by the time it grew. That said, if he doesn’t want sprayed branches, it’s his prerogative.
I myself have somewhat strong feelings against agro-chemicals (particularly *-cides, not so much ferts), but I don’t consider them an absolute deal-breaker. I trust that my fellow fruit growers will use their good judgement, and not send me something that will overtly poison me.
I once bought a daylily from ebay with the intent to eat from it, and on asking about the matter, the seller said they would send my particular roots untreated, so I could harvest the first season with confidence. So I’m sure if you raise any concerns with the person you’re dealing with, they’ll take your preferences into account.
As a related tangent, I bought some snail baits that were said to be “organic” (Garden Safe was the brand). I decided not to use them for a while, out of concern for my local millipede population (they’re wonderful little compost makers). I ended up using it as the snail and slug population started booming again, and while I haven’t checked on the millipede population lately, I think they’re probably doing fine in the compost pile – I know the centipedes are doing fine.
The snail baits did come with the standard warnings, but as they were safe to use with root veggies, I wasn’t too concerned. My question to those who aren’t as ignorant as I am… ¿Should I be concerned about the snail baits?