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no large contiguous blocks of hemlocks left in the park.” With more than 274 cultivars of eastern hemlock in use in landscaping, the adelgid is affecting more than the park’s hemlocks.
Hemlocks are not the only trees in eastern forests that are under attack by foreign invaders. The European gypsy moth (Lymantria dispar L.), which has been plaguing eastern forests since it first arrived in 1869, likes to eat the leaves of a variety of trees but is particularly fond of oaks, especially white oaks. White oaks are an important part of oak-hickory forests—which have the largest range of any of the Eastern Deciduous Forest communities.
On its way to our area from the Midwest is yet another insect pest: the emerald ash borer (Agrilus planipennis Fairmaire). An Asian cousin of our native ash borer, this small, bright-green beetle targets ash trees exclusively. Its larva feed under the bark, disrupting the . Infestations of this pest have destroyed 20 million ash trees so far. Gubler projects the infestation will probably arrive in our area within five to ten years.
A website set up by several states fighting this pest ((warns, “If it is not contained and eradicated, the impact of the emerald ash borer on the ash
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