Spray drift
nowhere is safe from chemical sprays.
It can be a real problem.
I'm on a modest 22 acres. We moved here 20 years back and one of our conscious decisions has been to use mechanical and biological weed control measures - we cut and dig out blackberry roots and all, we encourage the Chrysolina beetle to control St John’s wort, slash and leave Pattersons Curse, and over-graze some areas where the sheep and alpacas can control nuisance weeds.
The amount of bird life here has increased by an order of magnitude both in diversity and quantity, we have heaps of frogs and lizards and other critters that were virtually absent when we got here, and lots of sensitive native flora like various insectivorous plants, kangaroo grasses etc are re-establishing.
We have neighbours who still choose to spray poisons around, and the council, but all are well aware of our concerns and "organic" status and most do actually make a decent effort to ensure we get no spray drift.