Coverage of these grand hemlocks was excellent. We fully expect that our efforts will prolong their longevity. We are continuing the effort now from the ground for the shorter trees found along White Oak fire road, and along Skyline Drive within all three districts. We will continue twice-yearly applications. It acts as a suffocant, clogging the breathing apparatus of the soft-bodied adelgids.
Insecticidal soap is used in the spring because it is less likely to burn new spring leaf growth.
Though adelgids do not fly, they are continually brought into our hemlock stands via birds and mammals. As you have learned from us in earlier articles, harsh winter weather can contribute to suppressing adelgid population growth. These data were collected by Gary Hunt during the fall of 1996. Keep in touch with either of us if you would like more information.