The dreaded emerald ash borer has not yet made its way into Manitowoc County, but it has the area surrounded.
The ash tree-killing beetle was most recently discovered in Sheboygan earlier this month. It has also been found in Fond du Lac, Calumet and Brown counties.
As a result of the beetle's close proximity to the area, Manitowoc County was placed under quarantine by the Wisconsin Department of Agriculture, Trade and Consumer Protection in September 2014.
Quarantine rules restrict the movement of firewood and ash products out of quarantined areas.
Following those firewood rules is the best way to keep the EAB out of the county, according to City of Manitowoc Forester Al Rehme.
"The biggest thing is not to move any firewood that's from an ash tree," Rehme said. "Especially if they suspect they may have it."
Rehme said anyone suspecting a tree may be infected should contact the Wisconsin Department of Natural Resources office in Mishicot at 920-755-4981.
As for identifying trees that may be infected, Rehme said the beetle leaves distinctive marks on trees it's destroying.