DENVER - Pines are a popular landscape feature. They range from large pine trees to pint-sized dwarfs.

But when the foliage starts to turn brown, it can be cause for concern.

A deadly disease is attacking pine trees across Colorado.  Pine wilt, a disease caused by the pinewood nematode, is a small worm that’s transferred from tree to tree by the pine sawyer beetle.

Once your foliage starts to turn, you can’t save the tree.

Instead, experts at Swingle Lawn Tree and Landscape Care suggest treating your tree before it falls victim to the disease. Homeowners should inject treeage into the base of the trees to kill the pest.

The treatment lasts up to two years.