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The hemlock woolly adelgid, an invasive aphid-like insect, is destroying Pennsylvania’s state tree and its forest. It is a headache to many homeowners and conservationists, but there are ways to prevent the infestation from killing hemlocks.
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By some standards, poison hemlock is a rather pretty plant, identifiable by its tall, dotted stalk and delicate, white, umbrella-shaped blooms."If you…