SEATTLE (AP) — Washington state officials say they were again unsuccessful at live-tracking an Asian Giant hornet while trying to find and destroy a nest.

The Washington State Department of Agriculture said Monday that an entomologist used dental floss to tie a tracking device on a female hornet, only to lose signs of her when she went into a forest.

A previous attempt to capture and track a live hornet by gluing on a tracker also failed. About 18 of the hornets have been found in the state since they were first seen last year near the U.S.-Canadian border.