In article , Keith Dancey
writes
Has anyone any experience of
using sodium chlorate against horsetail? It would help if we could get
some "hands-on" feedback... I have never dared use it.

No, but a few years back someone posted here that he had eradicated his
by continually cutting it back over a period of about 5 years. He was
pretty vicious with it, never letting the foliage see the light of day.

--
Jane Ransom in Lancaster.
I won't respond to private emails that are on topic for urg
but if you need to email me for any other reason, put ransoms
at jandg dot demon dot co dot uk where you see