Ash logs undergoing vacuum treatment to kill emerald ash borer larvae. (U.S. Forest Service)
The shiny green one-half-inch-long, one-eighth-inch-wide emerald ash borer has destroyed tens of millions of ash trees in the U.S. since the beetle’s discovery in 2002 in Detroit.
The real Ash trees comprise around seven percent of the trees in eastern U.S. forests. In urban areas, ash trees make up about 50 percent of street trees.
Ash trees are important both economically and ecologically. A wide array of products are made from ash wood, including baseball bats, tool handles, pool cues, furniture, cabinets, oars, and acoustic and electric guitars. Ash seeds are an important food source for birds, mice, squirrels, and other small mammals. Ash trees also provide essential habitat for cavity nesting birds, such as woodpeckers, owls, and wood ducks. Read more »
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 »
Photo of S. galinae by Jian Duan, Research Entomologist, USDA ARS Beneficial Insects Introduction Research Unit
May 18-24, 2014 is Emerald Ash Borer Awareness Week
In our efforts to preserve and protect American ash trees from the damaging and invasive emerald ash borer (EAB) beetle, APHIS is working diligently to find and implement solutions that have the potential to successfully conserve this beautiful natural resource. Spathius galinae (S. galinae) just could be that newest weapon in the arsenal.
The tiny stingless wasp, about the size of a typical mosquito, targets and attacks EAB larvae living under the bark of ash trees. Crawling along the bark ridges and furrows, S. galinae somehow senses EAB larvae hidden below. The wasp not only accurately locates its target, but also is able to determine relative size—showing preference for large EAB larvae. Once a suitable larva is detected, the female wasp uses its long egg-laying organ (ovipositor) like a hydraulic drill to bore down through the layers of bark and deposit between 5 and 15 eggs on its host. After the eggs hatch, the wasp offspring feed on the EAB larva, eventually killing it. A new generation of S. galinae emerges in about 35 days. Read more »
The forests that cling to the steep slopes and cliffs of New Zealand’s Milford Sound are an example of the many pristine forest lands protected throughout the world (U.S. Forest Service/Robert Westover)
A world without forests would be pretty bleak. Life as we know it couldn’t exist. In fact it would, more than likely, be a dead planet. That’s because everything we take for granted; clean air and water, abundant wildlife and nearly every product we use in our daily lives, from the roof above our heads to pencils, wouldn’t exist.
It would be a challenge just to live one day without using a product derived from a tree. Aside from paper, you might not even be able to sit in a chair or desk at school or work. These things are part of our everyday existence because of forests.
Since trees are important for everyone around the world, the United Nations (U.N.) has designated every March 21 as the International Day of Forests. Read more »
New Zealand has one of the most well-developed forest biosecurity programs in the world. The logs pictured here at the Port of Tauranga were fumigated prior to export to minimize the chance of accidentally spreading forest pests. (U.S. Forest Service/Frank Koch)
Sometimes there is more to global trade than meets the eye. While consumers and economies may benefit from expanding market opportunities and a seemingly endless array of readily available goods, harmful pests could be lurking as people and products are transported between countries.
An international research network, including scientists from the U.S. Forest Service, has come together to share information about how exotic animals, diseases and plants can move and spread—and threaten agricultural and natural resources.
The International Pest Risk Mapping Workgroup consists of governmental and academic scientists from around the globe who study potential stowaway pests in order to assess the likelihood of their establishment in new locations and the impacts if and where they spread. Read more »
Emerald Ash Borer Awareness Week is May 19-25. David Cappaert, Michigan State University.
In this case it is green, a brilliant emerald green, and it is chomping its way through America’s forests. The emerald ash borer (EAB), Agrilus planipennis, may look pretty, but it is killing our ash trees in our forests and backyards.
This is Emerald Ash Borer Awareness Week (May 19-25) and the time of year when you might see adult beetles flitting about among your ash trees. It is also the time of year you may unknowingly move this pest if you pack firewood when you kick off the summer camping season. Read more »