Published: Jun 27, 2014 4:13 PM EDT
Updated: Jun 27, 2014 4:32 PM EDT

SANIBEL, Fla.- Vandals are carving graffiti, into trees at the Ding Darling National Wildlife Refuge.

Rangers say people walking along the Calusa Shell Mound trail are stopping to carve their names into Gumbo Limbo trees.
The carvings have been happening since 2010, but only recently spiked.

Six trees have now been vandalized.

The trees could become infected, potentially causing the refuge to cut them down.

"It is a federal offense to deface the trees. We find that once one people etches their initials or puts something in the tree, we get more and more people who do it," said Toni Westland, Supervisory Ranger for Ding Darling.

 Anyone with information about this or any other vandalism on the refuge, please contact Toni Westland at 239-472-1100, ext. 237