In article , Franz Heymann notfranz.
writes

No. You are unfortunately quite wrong. It is not your prerogative to
redefine technical terms which have a prior definition.
I have now found 9 separate references, originating in the UK and in
the USA, including Encyclopedia
Brittanica and Wikipedia in which herbicides are defined as
pesticides, and none, except you, which claim the opposite.

Wrong again Franz. I agree with and support Sacha in this matter.
--
Alan & Joan Gould - North Lincs.