With the temperatures dipping below freezing, many of us are burning wood in fireplaces or wood stoves. The following article is written by Marcia Anderson from EPA's Greening the Apple Blog. It is a good reminder to be careful when buying, transporting and burning firewood in order to prevent the spread of destructive invasive pests.
Over the past 15 years, exotic insects like the
Asian longhorned beetle,
emerald ash borer
(EAB), and hemlock woolly adelgid have killed millions of trees in
cities and forests across the United States. Once established in new
areas, these pests can quickly kill trees in our favorite forests,
parks, communities, and campgrounds. The U.S. Department of Agriculture
(USDA) estimates that over 30 million ash trees have already been killed
by the
emerald ash borer in Michigan alone, with millions dead or dying in other states (
see related blog).
Split firewood in a backyard
Photo: ©L. Greenwood; The Nature Conservancy
Firewood has been shown to be an especially troublesome means by
which pests are spread. According to the USDA, the best preventative
measure to protect our uninfested urban and rural forests from these
pests is to limit the movement of infested materials, including
firewood.
Firewood is frequently moved long distances by campers and retailers.
Not surprisingly, pest infestations are showing up around campgrounds
and highway rest areas. In many states, all trees used as firewood are
now regulated since they have the potential to harbor invasive insects
and diseases.
Firewood has historically been moved with little consideration of the
pests it could be harboring. However, the issue is getting increasing
attention. This year, USDA and several states put out urgent pleas to
avoid
transporting firewood Exit.
Emerald ash borer and its damage to an ash tree
Image: National Park Service
To protect forests and trees that are threatened by a host of
invasive insects and diseases, regulation has become necessary. While
regulations vary by state, they generally include restrictions on
importing firewood, the movement of firewood within the state, and the
transportation of firewood into state, local and federal parks.
Thirty states have imposed various levels of quarantine as a result
of the emerald ash borer. In the Northeast alone, most states have
restrictions on the movement of wood products. Other states, including
Minnesota, Wisconsin, Michigan, Illinois, Indiana, Kentucky, Ohio, and
Maryland, have also imposed regulations on the movement and importation
of firewood. Some regulations do not allow the transport of wood beyond a
50-mile radius of an EAB-restricted zone. A restricted zone is the
quarantine of an infested area that prohibits the movement of logs and
firewood outside of the zone. Check USDA’s
quarantine map
before you move firewood, even to another town. Because EAB does not
travel far on its own, limiting human transportation of infested
material will slow its spread.
Camping firewood on the move.
Photo: © L. Greenwood; The Nature Conservancy
It is recommended to use locally-sourced firewood, or firewood that
has been confirmed as pest free. Firewood producers and dealers must
provide documentation on the source of their firewood. Note that
seasoned wood alone is not an adequate treatment method because some
insects can survive in untreated firewood for many months. Only firewood
that is heat treated, kiln-dried (160° F for at least 75 minutes), is
allowed to be brought into parks with source documentation.
Be warned that RVs and other vehicles that have been parked for long
periods of time can also harbor tree pests and their eggs. If not
removed prior to a road trip, these vehicles can introduce pests into a
previously uninfested area. So, take the time to check your vehicle,
especially the wheel wells, and remove any insects you find. You can
also wash down your camper between trips to help remove any hitchhiking
pests.
What is at risk from transporting these pests? The trees in your
backyard, along your streets, and in your neighborhood, along with the
wildlife that depend on them. In addition, jobs in the timber and
forestry industries and manufacturing sector (flooring, cabinets,
pallets, and even baseball bats) are impacted. A direct consequence to
taxpayers are the costs borne by cities and towns to remove the
hazardous trees killed by these pests.
Preventing the spread of pests is one component of an
Integrated Pest Management program. Doing your part will help sustain the health of our great forest resources and neighborhood trees.
About the Author: Marcia is with EPA’s Center of Expertise for
School IPM in Dallas, Texas. She holds a PhD in Environmental Management
from Montclair State University along with degrees in Biology,
Environmental Design, Landscape Architecture, and Instruction and
Curriculum. Marcia was formerly with the EPA Region 2 Pesticides Program
and has been a professor of Earth and Environmental Studies, Geology,
and Oceanography at several universities.