Council Bluffs specialists are treating more than 1,000 trees.
They are hoping to stop the emerald ash borer.
It comes as Omaha is now responding to the beetle infestation. Omaha officials confirmed on Wednesday.
They were ash trees in Pulaski park. Council bluffs put its plan into effect last fall.
It removed dozens unhealthy ash trees.
Crews started treating the healthiest trees in the spring and those in a 15 mile radius. Council Bluffs officials hope to save 97-percent of the trees.
For more information about the emerald ash borer and how to protect your property, click here.