Michigan has revised its quarantine of the tree-killing emerald ash borer to include broader areas where the pest is known to exist as part of an effort to prevent its spread.
The Michigan Department of Agriculture wants to keep the ash borer out of the Upper Peninsula and says the changes put the state's quarantine better in line with federal efforts to contain the beetle.
Under the quarantine, ash materials or hardwood firewood may not be moved from southeast Michigan to any other area of the Lower Peninsula, and they also may not be moved out of the Lower Peninsula.
Violators may be punished by fines and jail time.
The beetle is blamed for the loss of more than 20 million trees in Michigan, Indiana, Ohio and Ontario, Canada.
Authorities say the bug is native to parts of Asia, and probably arrived in North America in wood packing materials. It first was detected in 2002 in Michigan and also has been found in Maryland, Virginia and Illinois.