The tropism characteristics of Diaphorina citri to LED light sources under different times and scenarios

Author of the article:DING Peng ZHAO Zheng LIU Xiao-Qing DOU Yuan-Jing WANG Shan-Shan LI Xiao-Xue ZHENG Wei-Wei ZH

Author's Workplace：College of Plant Science & Technology of Huazhong Agricultural University

Key Words：Diaphorina citri; light trapping technology; LED; monitoring and early warning; field application

Abstract：[Aim]  Diaphorina citri plays an important role as an insect vector for Citrus Huanglongbing (HLB), contributing to the spread of HLB, leading to economic losses in citrus production. Physical management is currently the main strategy for monitoring, forecasting, and controlling citrus psyllid. Among these strategies, LED light-based trapping technology has shown significant potential for practical application. To determine the attractive effect of LED light sources on citrus psyllids under different time periods and environmental conditions, and to identify the optimal wavelength range. [Methods]  We determined the attractive effects of seven LED light sources. These included white, pink, purple (435-445 nm), blue (455-460 nm), green (525-530 nm), yellow (590-595 nm), and red (625-630 nm), under indoor and outdoor conditions during daytime（9:00-10:00） and nighttime (20:00-21:00). [Results]  The results demonstrated that green and blue LED light sources significantly increased the attraction rate of D. citri. In the outdoor environment, blue, green, and white LED light sources attracted the highest proportion of D. citri during the daytime. Conversely at night, purple, blue, green, and white LED light sources attracted the most D. citri. [Conclusion]  These findings indicate blue and green LED lamps have superior attractant efficiencies under varying conditions of time (day/night) and environment (indoor/outdoor). Thus, these lamps are recommended as candidates within the visible light range of LED for the “lure and kill” technology in citrus phyllid control. The findings of this study will contribute to the development of a valuable light-attraction based technique for the control, monitoring, and early detection of citrus psyllid.