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Agrilus horni
aspen root girdler
Agrilus horni, commonly known as the aspen root girdler, is a metallic wood-boring beetle in the family Buprestidae. The species is a specialist pest of aspen (Populus tremuloides), causing damage by girdling the roots and lower stems of suckers. It is morphologically similar to Agrilus anxius (bronze birch borer) and Agrilus liragus (bronze poplar borer) but can be distinguished by its distinctive root-girdling behavior. The species has been documented in North America from Arizona, South Dakota, Wisconsin, and Michigan.