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This profile was last updated on 6/8/15  and contains information from public web pages and contributions from the ZoomInfo community.

Dr. Donald A. Eggen

Wrong Dr. Donald A. Eggen?

Forest Health Manager

Local Address: Middletown, Pennsylvania, United States
Pennsylvania Department of Conservation
400 Market Street
Harrisburg , Pennsylvania 17105
United States

 
Background

Employment History

Education

  • Ph.D.
57 Total References
Web References
"Hemlocks are what we call a ...
www.bayjournal.com, 8 June 2015 [cached]
"Hemlocks are what we call a foundation species," said Donald Eggen, forest health manager for the Pennsylvania Department of Conservation and Natural Resources.
...
Hemlocks and trout go hand in hand," Eggen said.
Tree Top Times Blog | Mountain High Tree, Lawn, and Landscape | Denver | Page 2
mountainhightree.com [cached]
Donald A. Eggen, Forest Health Manager, Pennsylvania DCNR, Bureau of Forestry
Invasive Species?
Today's News
www.prnewswire.com, 18 June 2002 [cached]
Purchase of the beetles, which cost $2 each, and their release and study are part of an effort to curtail the hemlock woolly adelgid's spread and damage, said Dr. Donald A. Eggen, chief of the Bureau of Forestry's Forest Pest Management Division.
The bureau and the U.S. Department of Agriculture's Forest Service have initiated a hemlock management plan, while also examining effectiveness of selective insecticide application, Eggen said.
The hemlock woolly adelgid first were found in the eastern United States in Virginia in 1956, and they invaded Pennsylvania by the mid-1960s.Small, soft-bodied insects closely related to aphids, exotic adelgids have few natural enemies in the eastern United States.They feed on young branches, resulting in premature needle drop and branch dieback.
The USDA Forest Service is providing $20,000 to fund the purchase of about 10,000 of the beetles from insect-rearing laboratories.DCNR is providing $140,000 for the remaining 70,000 beetles.
To learn more about this threat ...
www.thereporteronline.com, 22 April 2014 [cached]
To learn more about this threat to trees in our community, register to attend an educational presentation by Donald A. Eggen, Ph.D., Saturday, April 26 at Foulkeways at Gwynedd.
Eggen is a forest health manager for the Pennsylvania Department of Conservation and Natural Resources.
"It depends on which bug you're ...
www.timesobserver.com, 26 Mar 2014 [cached]
"It depends on which bug you're talking about," Donald Eggen, forest health manager with the Pennsylvania Department of Conservation and Natural Resources (DCNR) noted.
DCNR issued a statement Friday citing the impact below-average temperatures have had on the Hemlock Woolly Adelgid. According to the report, the agency is seeing massive die-offs of the invasive species.
"Right now, the insects are starting to become active, so it doesn't have to get that cold to impact them," Eggen said.
...
"It gives us time to catch our breath," Eggen said, adding, "[Adelgids] can suffer up to like 90-some percent reduction and still re-populate."
Eggen noted this is possible because all Hemlock Woolly Adelgids are female and lay eggs, so even a single specimen can re-populate an area.
...
"You get further south to the Smokies (mountains), where it never gets real cold and the hemlock are devastated," Eggen said.
The species, which originated in Asia, feeds on the fluids within Hemlock branches. While the species has come to threaten the entire Eastern United States, it is particularly worrisome in Pennsylvania, where it feeds on the state tree, the Eastern Hemlock.
Other potentially-damaging species, however, won't be impacted as heavily by the cold. Eggen assessed the potential impact of the weather on two other species, the Emerald Ash Borer and Gypsy Moths.
"In my opinion, the larvae over-winter under the tree bark," he said of the ash borer. "There is some die-off from thinner bark trees, but a really thick bark, it acts as insulation. It cuts back come, but are you going to eliminate it? I don't think so."
As for gypsy moths, the species which is his area of concentration, Eggen said the moths lay egg masses at ground level, which allows snow to act as insulation.
"In my entire career, I've seen that one time," he said of conditions severe enough to cause a large die-off.
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