Effects of LED sources on the behavior of adult Plagiodera versicolora
Author of the article:FENG Guo-Feng** FENG Xing-Hai DENG Qian-Wen GOU Lu-Chen KANG Hao-RanZHU Yun-Long FU Li XIA Fei
Author's Workplace：College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China
Key Words：Plagiodera versicolora, behavior, light emitting diode (LED)
Abstract：[Objectives] To investigate the effects of different light-emitting diode (LED) sources on the behavior of adult Plagiodera versicolora (Laicharting) and thereby assess the potential of using this technology to predict the damage caused by this pest and disrupt its behaviour. [Methods] The circadian behavioral rhythm of P. versicolora was monitored for four days and their behavior observed continuously for three hours under six different LED sources (red, 620-625 nm; yellow, 580-585 nm; blue, 465-467 nm; green, 520-523 nm; white, 460-465 nm and flashing LED source) under standard laboratory conditions. [Results] (1) There were insignificant differences in the circadian behavioral rhythms of female or male adults during the dark phase of different light treatments. Peak activity of female adults under a 12 h dark︰12 h light and 12 h white︰12 h light treatment occurred at noon, whereas peak activity of those under a 12 h yellow︰12 h light and 12 h green︰12 h light treatments occurred between 18:00—19:00. Peak activity of those under other light regimes occurred in the morning. Peak activity of male adults under a 12 h yellow︰12 h light and 12 h blue︰12 h light treatment regime occurred between 18:00—19:00 and 08:00—09:00, respectively, and that those under other light regimes occurred between 11:00—12:00. There were insignificant differences in activity frequency in the dark phase between females and males under the same light regime. (2) There were insignificant differences in the frequencies of various behaviors among females subject to different light treatments for three hours. However, there was a significant difference in the amount of time spent walking, resting, or wing-spreading among males under different light treatments. Under the same light regime, walking or resting were more frequent than other behaviors in both females and males. For female adults, the rate of resting was highest under white light and lowest under green light. However, for males, the rate of resting was highest under yellow light whereas that of walking was lowest under green light. Under the same light regime, there were differences in behavioral frequencies, or the rates of some behaviors, between females and males. [Conclusion] These results indicate that different LED sources have different effects on the behavior of P. versicolora adults.