A GROUP of parents have voiced their outrage after discovering that the controversial glyphosate-based weed killer, Roundup, had been used at a playground at Rye Bicentennial Park.Mum Alexandra said she was shocked to see a maintenance worker holding a five-litre container with a nozzle to spray the herbicide on weeds on the tanbark within the playground located at Point Nepean Rd about 10am on Thursday 14 October – which the Mornington Peninsula Shire has since admitted to The News that it was an “operational error”. “I was walking my dog and there was a contractor spraying tanbark in the playground,”…