Several hundred non-native forest insect species have become established in the U.S. Recent arrivals, such as this adult Asian longhorned beetle, have killed millions of trees and altered urban landscapes in the Northeast and Midwest. (U.S. Department of Agriculture/Kenneth R. Law, courtesy of Bugwood.org)
This post is part of the Science Tuesday feature series on the USDA blog. Check back each week as we showcase stories and news from the USDA’s rich science and research portfolio.
Wood makes great packaging material—it’s inexpensive, abundant and versatile—but there’s one drawback: destructive forest pests stowaway in the pallets, crates and dunnage (wood used to brace cargo) used in international shipping. Over many years, international trade has resulted in the inadvertent introduction of many non-native wood-feeding pests and plant pathogens in the U.S. and throughout the world. Some of these non-native insects, including the emerald ash borer and the Asian longhorned beetle, have become highly invasive and caused serious environmental and economic impacts.
But an international standard for wood packaging material is slowing the inadvertent export of invasive bark- and wood-boring insects, according to a study conducted by Robert Haack, a research entomologist with the Forest Service’s Northern Research Station in Lansing, Mich., and a team of scientists. Researchers found as much as a 52 percent drop in infestation rates in the U.S., where the standard was implemented in three phases between 2005 and 2006. The study was published May 14 in the journal PLOS ONE. Read more »
Harvard Forest staff renovated a pole barn to house the boiler room and modern wood shop. The new boiler room (left side of the building) contains three wood gasification boilers, a 2,500-gallon thermal storage tank, a propane-fired backup boiler and associated pumps and system controls. The sloped roof on the left of the building provides a dry storage area for racks of firewood prior to loading in the boilers. (U.S. Forest Service/Rob Clark)
I recently had the opportunity to speak at the dedication ceremony for the Harvard Forest Wood Energy Project, an exciting venture partially supported by the U.S. Forest Service Northeastern Area. This woody-biomass heating system will support 50,000 square feet of the central campus buildings and five dormitories, replacing fuel-oil with renewable firewood that comes from Harvard Forest, a 3,500-acre laboratory and classroom in Petersham, Mass., and owned by Harvard University.
A unique aspect of this project is that it is at the heart of a long-term forest carbon research project. Not only are carbon flows in the Harvard Forest where the wood for the new energy system will come from already being closely studied, but now every aspect of the new installation will be very closely monitored and studied as well. Read more »
A fossilized tree stump on the Gallatin National Forest. The stump is part of a huge forest that was buried in a volcanic eruption 50 million years ago. (U.S. Forest Service photo)
Imagine nearing the remote, rugged crest of the Gallatin Range in Montana’s Gallatin National Forest. As you scramble up-slope, you put your hand against what appears to be a lightning-blasted stump for balance. But the stump is not weather-polished wood—it’s made of stone.
These are the 50-million-year-old remains of redwoods, pines and sycamores which make up the Gallatin Petrified Forest, where fossilized tree trunks are preserved in so much detail that cellular structures may be seen under a microscope and growth rings are often visible to the naked eye. But how did these trees turn to stone? Read more »