BAC wrote:

Sorry about that - I use the term 'pesticides' to include herbicides,
insecticides, fungicides, etc. I don't think I'm alone in that, but
apologise for any confusion. In this context, I meant weedkiller,
specifically one not fatal to lawn grass.

You are correct in your use of the term "pesticide". It is a general
term that includes herbicides, insecticides and fungicides. Weed killer
is a herbicide which then means that it is a pesticide.

--
Howard Neil