Governor Dayton has proclaimed this week, May 20-26, to be Emerald Ash Borer Awareness Week in Minnesota. Emerald Ash Borer (EAB) is an invasive species of insect that has killed millions of ash trees in North America. It is not native to the U.S., but was discovered in Michigan in 2002; in 2009, the first Minnesota case of EAB was found in Ramsey County. It has since been found in the counties of Houston, Hennepin, and Winona.
The biggest risk of spreading EAB comes from people moving firewood or other ash tree products with EAB or EAB larvae inside. In order to help prevent the spread of EAB throughout Minnesota and beyond, you should try to use only local firewood, and you should avoid transporting firewood if possible. In order to prevent the spread of this destructive species, the Department of Agriculture has prohibited the movement of ash trees, ash limbs and branches, ash logs or untreated ash lumber with bark attached, firewood from hardwood trees, and uncomposted wood chips and ash bark chips greater than one inch in two of three dimensions from the affected counties. More tips on preventing the spread of EAB can be found at the Minnesota Department of Agriculture website.
You should also watch for signs that ash trees on your property are infested: heavy woodpecker activity, S-shaped tunnels under the bark, dead branches in the top canopy of the tree, and D-shaped exit holes approximately 1/8 inch in diameter are all signs of EAB presence in a tree. If you suspect a tree is infested, you can follow procedures for seeking treatment or removal of the tree from the Minnesota Department of Natural Resources website.
The Department of Agriculture, partnering with Working Dogs for Conservation, has trained four sniffer dogs that it hopes can help locate EAB infestations in trees and wood piles that would otherwise be invisible to human observers. The dogs – two labs and two German Shepherds – are the first of their kind in the U.S., and could be ready to start sniffing mulch piles, yard waste sites, and commercial vehicles by July.
You can see a video featuring the dogs in action below: