Native trees have been poisoned at two coastal locations, with a third possible instance under investigation.
Herbicide testing has confirmed the trees at First Bay, Coolum, were poisoned, and a sign has now been put up as a warning.
The second incident was at Donegal Drive Environment Reserve, Coolum, with Sunshine Coast Council prosecuting a case of vegetation damage. It resulted in a $20,000 fine and an additional $14,452 in compensation.
A third location near the Coolum boardwalk is also under investigation due to suspicious damage.
Poisonings at Peregian Springs and Marcoola are also still being monitored closely by the council, with limited recovery of vegetation occurring due to the significant damage from the poison.
The council has also noted that four street trees are no longer present on the verge opposite beach access 82.

Councillor Maria Suarez said the council was committed to protecting and preserving the environment.
“We will continue to take strong action against those responsible for damaging vegetation and urge residents to report any suspicious activity and help us protect our beautiful coastal areas,” she said.
“Those found guilty of such offences can be fined up to $131,580 and anyone with information is urged to call council.”
Related story: Poisoned trees found opposite beachfront properties
Investigations were made at First Bay after the council received reports of suspicious decline in health of the native plants in the area.
Independent testing confirmed the presence of three separate herbicides, impacting vegetation next to beach access 82 in the Yaroomba Coolum Foreshore Reserve.
Cr Suarez said she was saddened by the destruction of trees.
“It is deeply troubling to see such deliberate damage to our precious native vegetation,” she said.

“Council is committed to preserving our natural environment, and we will take all necessary steps to hold those responsible accountable.
“The destruction of vegetation not only harms the environment but also affects the entire community.”
If you notice suspicious vegetation damage occurring in council-managed reserves or parks phone customer services on 5475 7272.