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Identity and Biology of an Aspen Root Girdler, Agrilus horni

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Killing of aspen suckers is caused by a root infesting beetle, Agrilus horni. The species is closely related morphologically and by host to the bronze birch borer, Agrilus anxius, and the bronze poplar borer, Agrilus liragus, respectively. It can be readily distinguished from the morphologically similar "cousins" by its habits. Eggs are laid near the ground line on suckers. The larva bores down to the cortex then follows this zone in a fairly straight line out along the main root. It turns back into the camb um and returns to the main stem in a spiral gallery encircling the root. This spiral gallery is continued up the stem for a few inches, girdling the plant. The insect may become a serious problem in experimental outplantings of aspen and on the poorer natural aspen sites.

Document Type: Journal Article

Affiliations: Entomologist, U. S. Dept. Agric., Insect Identification and Parasite Introduction Branch, Washington, D. C.

Publication date: March 1, 1965

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