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tions are still being explored, but the best hope seems to lie in wasps that parasitize the larvae. Fungi, parasitic nematodes and mites, predatory insects, and woodpeckers are also likely soldiers in this war.
Since native biological controls have proved ineffective in combating hemlock wooly adelgid, some insects that are known to feed exclusively on this insect have been introduced from Asia and are slowly becoming established throughout the infested region. In the meantime, the park is injecting a systemic pesticide in the soil surrounding individual trees, which has proven to be effective.
While some pest-management strategies are hard for an individual landowner to undertake, others are doable. In any case, it’s important for those with native trees on their properties to learn the signs of infestation and alert their local Virginia Cooperative Extension agent or state forester.
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