michael adams wrote:
"La Puce" wrote
[ill effects from herbicides]
Surely the lesson to be learned there, is if you're going to
use glyphosphate as a spot weedkiller in the garden, more especilly
in a suburban garden, don't try and and apply it using a crop
spraying aeroplane. More especially in windy conditions.

Which seems sensible enough advice to me.

I should think so.. I have a fairly large area including J. Knotweed
and G. Elder to deal with, so I will be using a backpack, hopefully
on a cool-ish day with no wind!