Double said the disease spreads through the roots and is carried by beetles. In North America, the beetles that carry the disease are the native elm bark beetle, the European elm bark beetle, and the banded elm bark beetle.
Accompanying Double was Clark Haynes, retired from the Department of Agriculture Plant Industries Division and a former classmate of Double's at WVU. Haynes is an expert on forest health and was a major contributor to an important document, "West Virginia Statewide Forest Resource Strategy," prepared by the West Virginia Division of Forestry in June 2010.
Haynes said the elms are "precocious seeders," but that it is important to keep the large ones healthy.
The fungicide used is called Arbotect by Syngenta. Although it costs $417 a gallon and they need four gallons (totaling $1,668) to take care of the 12 trees, Winfree sees it as a good investment. He knows that the trees are integral to the historic beauty of the property. The cost is part of the operating cost of Glenwood controlled by the Historic Glenwood Foundation board of directors.
"I don't want anything to happen to the elms under my watch," Winfree said. His grandchildren, Isaac, William and Malia, were fascinated by the process and darted around the property retrieving information for their grandfather and chatting with Double.
The process takes two days. The amount of chemical used depends on the diameter of the tree. A series of small holes are drilled into the base of the tree, and a series of tubes with small emitters are placed in the holes. The chemical is pumped slowly into the tree.
One application of Arbotect by infusion protects the entire canopy for three growing seasons.
Reach Sara Busse at sara.bu...@wvgazette.com or 304-348-1249.