GREEN BAY, WI (WTAQ) - Wisconsin’s annual search for the tree-killing emerald ash borer will be focused mainly in the northern half of the state.

Personnel from the agriculture department have started hanging over 2,100 box-like detection traps in ash trees. Almost all of them are being placed north of a line from Manitowoc to Trempealeau.

About 100 are being placed in the southern half of Wisconsin.

12 counties are under quarantine for the emerald ash borer. It restricts the movement of firewood, nursery stock, and other ash products.

The quarantine is in La Crosse, Vernon, Crawford, Brown, Fond du Lac, Sheboygan, Washington, Ozaukee, Waukesha, Milwaukee, Racine, and Kenosha counties.