University of Vermont entomologist develops method of protecting hemlocks from woolly adelgid, field trials with insect-killing fungus reduce adelgid growth rate by 50%
Wendy Lisney
BURLINGTON, Vermont
,
May 5, 2011
(press release)
–
Hemlock is the third most common tree species in Vermont. But it soon may drop off the list, going the way of the now-vanished chestnut and elm. An invasive pest, hemlock woolly adelgid, has been marching and munching its way north along the Appalachians — killing pretty much every hemlock it can sink its sap-sucking mouthparts into. The adelgid recently arrived in southern Vermont.
Nobody thinks the adelgid pest can be eliminated. But Costa has had success with field trials on one-acre forest plots in Tennessee, using helicopters to drop the fungus — mixed with his proprietary blend of growth-enhancing ingredients — into the epicenter of the adelgid’s devastating attack. These trials reduced the growth rate of adelgid by fifty percent — “that’s the first time that’s been demonstrated with an insect-killing fungus,” Costa says — and it seems likely to give trees a fighting chance of recovery. Over the last year, Costa has been testing the same technology on single trees in Vermont to see if ground-based spray applications will work, too. UVM Today dropped in on Costa in the field at Townshend State Park, north of Brattleboro, Vt., and in his laboratory at Jeffords Hall on campus. We wanted to see if his latest experiment would succeed.
So far, only extreme cold stops the hemlock woolly adelgid. But the University of Vermont’s Scott Costa may soon give forest managers and homeowners a tool to fight back.
Working with the U.S. Forest Service, the State of Vermont, and others, Costa, an entomologist in UVM’s Department of Plant and Soil Science, has been developing a novel method of putting an insect-killing fungus,
lecanicillium muscarium, to work protecting hemlock trees.
Industry Intelligence editor's note: the remainder of this story can be viewed as a Webcast on the University of Vermont's Website at http://www.uvm.edu/.
* All content is copyrighted by Industry Intelligence, or the original respective author or source. You may not recirculate, redistrubte or publish the analysis and presentation included in the service without Industry Intelligence's prior written consent. Please review our terms of use.