The Michigan Department of Agriculture will come in and drop every one- to four-inch tree. Then state contractors will remove the larger material. The smaller ash trees felled during the first eradication phase will remain on the ground in wood lot areas. Sanctuary trees, which have been set up as a bait of sorts for any remaining ash borers in the eradication zone, will remain until next fall. Cheboygan County campgrounds, nurseries, lumber mills and lumber contractors will be visited by a Michigan Department of Agriculture inspector in the upcoming months. Newly released numbers show that ash borer infestation has doubled in the state since March 2005.