[Objectives]  To evaluate the effectiveness of trapping Dendrolimus tabulaeformis with different wavelength LED lamps and thereby identify the best wavelength of LED lamp for monitoring and controlling this pest. [Methods]  The attractiveness of four different wavelengths of LED lamps (365, 380, 420, 470 nm) to D. tabulaeformis was measured by trapping in the field and conducting phototaxis selection experiments in a laboratory. The activity rhythm of D. tabulaeformis was analyzed and the fecundity of females light-trapped in the field was compared with that of an indoor control group. [Results]  Significantly different numbers of D. tabulaeformis were trapped using 365 nm and 380 nm lights in the UV region and 420 nm and 470 nm lamps in the blue region. Males and females were trapped mainly between 23:30 and 1:00. The average fecundity of females light-trapped in the field (550 ± 89) eggs/adult was significantly higher than that of an indoor control group (263 ± 88) eggs/adult. About half the eggs of light-trapped females had not been laid. [Conclusion]  UV light-traps caught most D. tabulaeformis before 2:30 at night. Light-trapping reduced the amount of eggs laid, thereby decreasing the abundance of the subsequent generation in the forest. These results provide a useful reference for using LED lights to monitor and control D. tabulaeformis.