The mortality of naked Anoplophora glabripennis Motschulsky (Coleoptera: Cerambycidae) larvae exposed to ethanedinitrile (cyanogen; C₂N₂) varied with temperature, time of exposure, and dose of ethanedinitrile. The concentration × time (Ct) product of ethanedinitrile over a range of temperatures (4.4, 10.1, 15.6, and 20.1°C) decreased with increasing temperature, for both 3- and 6-h exposures. The Ct products varied with time of exposure at different temperatures. The variations in mortality at different temperatures are described with a slope ratio (Y = [slope]_6h/[slope]_3h). At different temperatures, the concentration of ethanedinitrile and the duration of exposure play different roles in killing A. glabripennis larvae. These results suggest the control of A. glabripennis larvae within wood is achievable.