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The Virginia Division of Forestry, in cooperation with the U.S. Forest Service is now testing the effectiveness of a natural virus on small gypsy moth populations near Chester Gap in Rappahannock County.
The virus, formulated by the U.S. Forest Service, was first applied by helicopter April 30. A second application will follow on May 7.
The test area is a 150-acre tract of land west of Chester Gap, near the Shenandoah National Park.
According to the Virginia Division of Forestry (VDF), the purpose of the test is to determine whether an early application of the virus will control the gypsy moth for a period of several years. “It may not stay long enough to work,” said Bill Vemam, area forester for Rappahannock and Fauquier Counties.
Because the virus is “host specific,” explained Vemam, it only affects the gypsy moth. Innate in the Gypsy moth, the virus normally asserts itself in large populations when stress factors are present, such as competition for food. Then the natural virus causes a collapse in population.
But it takes about two years for a
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