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Hemlock Woolly Adelgid

Pennsylvania Department of Conservation and Natural Resources - Forestry Archive, , Bugwood.org
Adelges tsugae Annand This insect is the one most commonly encountered and can cause the death of the tree if left untreated. This bug is an example of how the import of pests, in this case from Asia, can have devastating results to our forests and landscapes. Since there are no indigenous predators for this insect, it has spread unchecked throughout our landscapes and is threatening the native stands of Hemlock. The adelgid itself is a small black insect that attaches to the underside of hemlock twigs, where it remains and feeds. As the insects develop, they secrete the characteristic white wax that gives the bug its name. A mature infestation of adelgid looks like small cotton balls have been pasted to the underside of the twigs. Young trees are typically left alone, however all older trees will be attacked as this insect is ubiquitous. Fortunately, this insect has proven to be easy to control, and there has been success in reviving trees with significant damage and heavy infestations.  
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