Blue Light Attracts More Moths and Promotes Their Flight Speed.

Light traps are a useful method for monitoring and controlling the important migratory pest, the fall armyworm, . Studies have shown that is sensitive to blue, green, or ultraviolet (UV) light, but the conclusions are inconsistent. Furthermore, conventional black light traps are less effective for trapping . To improve the trapping efficiency of this pest, it is crucial to determine the specific wavelength to which is sensitive and measure its flight capability under that wavelength. This study investigated the effects of light wavelength on the phototaxis and flight performance of . The results showed that blue light was the most sensitive wavelength among the three different LED lights and was unaffected by gender. The flight capability of varied significantly in different light conditions, especially for flight speed. The fastest flight speed was observed in blue light, whereas the slowest was observed in UV light compared to dark conditions. During a 12 h flight period, speed declined more rapidly in blue light and more slowly in UV, whereas speed remained stable in dark conditions. Meanwhile, the proportion of fast-flying individuals was highest under blue light, which was significantly higher than under UV light. Therefore, the use of light traps equipped with blue LED lights can improve the trapping efficiency of . These results also provide insights for further research on the effects of light pollution on migratory insects.