any of various homopterous insects of the family Adelgidae, as Adelges abietis and Pineus pinifoliae, that feed and form galls on conifers.
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The adelgid is fairly vulnerable to cold temperatures—it lives on the outside of its host tree, and dies when the air gets colder than about -5 degrees Fahrenheit.
The progress of two invasive insects, the emerald ash borer, and the hemlock wooly adelgid, could be paused across the midwest by the freeze.