If they are still alive i doubt its any worse than the pesticides found on fruit in the markets if washd frozen and microwaved as most do i wouldnt worry, if spraying affected them they would be exticnt like rabbits are since the mixo and calicy virus's were released right??
These blackberry bushes were on private land and by the look of them no one had sprayed them. Grew up on a farm and I know what plants that have been sprayed with round up look like, plus these bushes were so big you could fit two houses in the space they took up so any amount of spraying wouldn't do the trick unless you used agent orange. I'll see you in twenty years. Twich, Twich.