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Your Position :Home->Past Journals Catalog->2015年52 No.3

Effects of sub-lethal concentrations of Azocyclotin on the movement rates of Tetranychus turkestani (Ugarov et Nikolskii)
Author of the article:LIU Min** LI Yong-Tao LI Ting SU Jie DUAN Xiang-KunWANG Zhen-Hui ZHANG Jian-Ping***
Author's Workplace:College of Agriculture, Shihezi University, Shihezi 832000, China
Key Words:Azocyclotin, sublethal concentrations, Tetranychus turkestani, Track Sphere LC-100, motion rate
Abstract: [Objectives]  To provide a scientific basis for the influence of Acraicides on the behavior of Tetranychus turkestani, and a theoretical basis for investigating the effect of sub-lethal (LC10, LC20), and lethal, concentrations (LC50) of Azocyclotin on the movement rates of T. turkestani. [Methods]  The leaf immersion method was used to ascertain the median lethal concentration and sub-lethal concentrations of Azocyclotin. A tracksphere locomotion compensator with behavior recorderTrack Sphere LC-100was used to record the movement rates of T. turkestani following exposure to the different sub-lethal concentrations of Azocyclotin (LC10, LC20 and LC50). Differences in movement rates following exposure to different concentrations of Azocyclotin, on different days and during different time periods, were analyzed. [Results]  The results show that exposure to sub-lethal concentrations of Azocyclotin reduced movement rates relative to the control between 10:00 and 12:00 on the first and third day post-exposure. However, rates of movement were not significantly different from the control between 10:00 and 12:00 and between 20:00 and 22:00 on the third and fifth day. Exposure to sub-lethal concentrations increased the movement rate of T. turkestani on the first day between 10:00 and 12:00 compared to that between 15:00 and 17:00 and between 20:00 and 22:00. However, there was no significant difference in rate of movement during these three time periods on the third and fifth day. Exposure to the LC10 dosage significantly increased the movement rate of T. turkestani between 10:00 and 12:00 on the first day compared to that during the same period on the third and fifth days. Nevertheless, no significant difference was found between animals treated with LC20 and LC50. Exposure to all three sub-lethal concentrations significantly reduced movement rates between 15:00 and 17:00 on the third and fifth day. There was, however, no significant difference in movement rates between 20:00 and 22:00 on the third and fifth day. [Conclusion]  The effects of sub-lethal concentrations of Azocyclotin on the movement rates of T. turkestani depended on pesticide concentration and time elapsed since exposure to the pesticide. The higher the sub-lethal concentration of Azocyclotin, the slower the movement rate of T. turkestani. However, this effect dissipated, and eventually became insignificant, over time.

 

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