A stand of beech trees in Ohakune has been affected by a heartwood fungus.
Ohakune woman Anthea Hatfield said she noticed the state of the trees earlier this month.
"I was just driving back towards them and I thought 'Wow, that doesn't look healthy'," she said.
"It's an incredible stand of beautiful native timber, and it makes Ohakune look fantastic in my opinion. I don't want this fabulous stand of trees right in the middle of town to be dying."
Downer NZ contract manager Carol Woodmass confirmed the trees, near the Ohakune Information Centre, had the heartwood fungus Ganoderma applanatum, which was a wood-decomposing plant pathogen that could cause trees to die.