Beverley Lib Dems have launched a petition asking the council to stop using a weedkiller that can be lethal to the public and the environment.
Glyphosate - banned or restricted by 80 UK councils - is charged with causing unsightly damage to grassed areas as well harming bees and worms and being dangerous to pets and children.
Lib Dem Cllr Linda Johnson said: “A walk around St Mary’s shows the margin of destruction around lampposts, signs and verges, which East Riding Council officers admit contains glyphosate.”
Lib Dem-run Beverley Town Council has a policy that it should only be used when absolutely necessary to kill invasive species such as Japanese knot weed - but this is being flouted.
Cllr Johnson said: “Use of this product is unnecessary in our towns and villages.
“All plants contribute to biodiversity but, if they need to be controlled, then strimming or hot foam are alternative, non-toxic methods.
“Strimming is just as quick, does not leave brown, unsightly patches and does not harm bees and worms, which are so vital to us for our food.”
Cllr Johnson said: “The last time we asked the Conservatives to ban glyphosate it was voted down. It’s about they time started listening and I hope Beverley residents will add their voices to the campaign.”
Sign Linda’s petition at www.eastridinglibdems.com/beverley-weedkiller