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N.D. (AP) — Agriculture Commissioner Doug Goehring is urging North Dakotans who buy nursery stock to check for Japanese beetles.

The beetles have been found in North Dakota every year since 2012, but Goehring says officials don’t believe large numbers of the pest are yet in the state. They want to keep it that way. The Agriculture Department also is seeking volunteers to help place traps around the state.

The beetles feast on everything from rose bushes to corn crops. They’re about half an inch long, and metallic green with bronze wing covers.

The beetles were first found in the U.S. in 1916. They’ve since spread to every state east of the Mississippi River, as well as to Minnesota, the Dakotas and Montana. They cause hundreds of millions of dollars in damage annually.