Shoalhaven City Council rangers will demand Warren Mundine's campaign signs are removed from trees they have been pinned to along Moss Vale Road.
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The signs were screwed to spotted gum trees on the council strip.
It is illegal to display election campaign signs on council land without permission according to Shoalhaven Mayor Amanda Findley.
She said a number of residents have contacted council rangers to report the signs, and rangers will contact Mr Mundine's campaign staff to ensure the signs are removed. If they are not removed within a reasonable timeframe, rangers will issue fines.
The matter sparked public outrage when Mr Mundine's political rivals took to Facebook to complain.
Putting screws into trees can make them susceptible to decay or reduce their life expectancy.
"Gilmore is sick of being screwed," Greens Candidate Carmel McCallum said.
"We are seeing Warren Mundine the Liberal candidate's posters everywhere screwed into trees on public land.
"It shows contempt and disrespect for the environment, which is reflected in their total lack of policy on climate change.
"These photos were taken on Saturday on Moss Vale Road, Cambewarra. You can see how his signs have been screwed to the flesh of these beautiful spotted gums multiple times."
It is understood Mr Mundine's signs have also been screwed to trees along the Princes Highway at Morton National Park and along the highway towards Moruya.
Mr Mundine was unavailable for comment on Tuesday afternoon.