ST. PAUL, Minn. (AP) - Emerald ash borer has spread to another Minnesota county.

The Minnesota Department of Agriculture on Tuesday confirmed an emerald ash borer infestation in Scott County. The tree-killing invasive pest was found on an ash tree on private property in the city of Prior Lake.

The infested tree was discovered through a call to the state Agriculture Department's Arrest the Pest information phone line. Based on the call, department staff visited the site and determined the tree was infested with emerald ash borer.

Because of the find, Scott County will be put under emergency quarantine. The county eventually will become the 10th Minnesota county under a state and federal quarantine aimed at preventing emerald ash borer from spreading.

Emerald ash borer was first discovered in Minnesota in 2009.