A bit of back ground.
I have for the last three years sprayed the weeds that grow in neighbours garden up the wire fence that divides the gardens, by mutual consent.
The neighbour was elderly and his gardeners were only pulling out weeds in the middle of the garden , I say pulling out breaking the tops off and leaving roots is more like it.
My neighbor's son was aware of my spraying and did his best to assist in making sure not too much weed came my side of the fence. I also washed the near side of next doors garden with slug nematodes to keep the ever growing population in my garden down.
I now have new neighbors who apart from sticking up a shed and clearing a patch of crocosmia to plant some beans have left the weeds on the boundary to go mad.
The slugs and snails are coming through like mad as the patch cleared for the shed and beans was the slug and snail central command, under the thick foliage of blue bells elephant ears and crocosmia .
I have no intention of buying extra nematodes to do the near part of their garden this year, but is it ok to spray through a wire fence to limit the weeds ?