A lawn care product being used to kill weeds could also be harmful to trees.

The herbicide Imprelis is believed to be behind yellow needles and contorted growth in spruces and other evergreens.

"We are hearing from other arborists throughout the state, nation and throughout the country with this problem," said Chris Shlum, a certified master arborist.  "It's not just localized just here in Columbus or even just a certain property.  It sounds like it's going to be a pretty big problem."

Ron and Caryl Schull, of Gahanna, said their landscaping suffered a major setback when three of their trees began to show signs of dying.

They said the problems developed after their landscaper used Imprelis to treat some weeds near the trees.

"They spot-sprayed weeds around the trees, leeched into the soil and now you can see the results," Ron Schull said.

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