Scientia Agricultura Sinica ›› 2014, Vol. 47 ›› Issue (22): 4436-4444.doi: 10.3864/j.issn.0578-1752.2014.22.009

• PLANT PROTECTION • Previous Articles     Next Articles

Rhythm of Rice Leaf Folder (Cnaphalocrocis medinalis) to the Searchlight Trap

QI Hui-hui, ZHANG Yun-hui, WANG Jian, PENG He, ZHANG Zhi, CHENG Deng-fa   

  1. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193
  • Received:2014-04-30 Revised:2014-07-04 Online:2014-11-16 Published:2014-11-16

Abstract: 【Objective】 The objectives of this study are to clarify the rhythm of rice leaf folder (RLF) (Cnaphalocrocis medinalis) to the searchlight trap, provide reference on monitoring and forecasting of C. medinalis, confirm the superiority of searchlight trap on monitoring migrant pests, provide data supports for biological parameters setting of trajectory analysis, and to propose a reasonable and economical plan for cutting off lighting.【Method】C. medinalis was trapped at nights by searchlight traps with automatic time-switches in Xing’an County, Guangxi Zhuang Autonomous Region in 2012 and 2013. The sampling times were 19:30-21:00, 21:00-23:00, 23:00-01:00, 01:00-03:00, 03:00-05:00, 05:00-06:00 with 6 lights, and 19:30-21:00, 21:00-22:30, 22:30-00:00, 00:00-01:30, 01:30-03:00, 03:00-04:30, 04:30-06:00 with 7 lights. The last ten days of May to the middle ten days of June were immigrant periods of C. medinalis. The end of June to the middle ten days of July were emigrant periods of C. medinalis. During different migrant periods, the days of C. medinalis amount suddenly increase were analyzed. The peak time to the searchlight trap was determined with Chi-square statistical analysis between single interval catch numbers and average interval catch numbers.【Result】The annual trapped amount of C. medinalis in 2012 and 2013 was different, but both of years had similar population dynamics with the most trapped amount of C. medinalis at 3rd generation and 4th generation. Stable rhythm of C. medinalis to the searchlight trap was obtained, but that was different in different migrant periods. Landing of migrant population occurred continually as a result of different flight abilities and atmosphere factors. For immigrant C. medinalis in 2012 and 2013, the peak time to the searchlight trap appeared mostly after mid-night, mainly during 01:00-03:00 and 03:00-05:00. Whereas, for emigrant and local C. medinalis, the peak time to the searchlight trap appeared mainly during 19:30-21:00 and 21:00-22:30. The rhythm of C. medinalis to the lights based on using searchlight trap was different from that using traditional light traps because the former can trap insects at least 500 m above ground level. C. medinalis usually took off in a large scale after sunset, the populations with shortest flight duration and longest flight duration landed during 23:00-01:00 and 05:00-06:00, respectively, and they flied for 3 h and 10 h, respectively. The source areas of C. medinalis would be more precise during trajectory analysis with the consideration of peak time to the searchlight trap.【Conclusion】The rhythm of C. medinalis to the searchlight trap was different in different migrant periods. The information of rhythm to the searchlight trap was more comprehensive than that to the traditional light traps. Considering rhythm to the searchlight trap will provide more precise time parameters for trajectory analysis.

Key words: rice leaf folder (Cnaphalocrocis medinalis), searchlight trap, rhythm to the lights, trajectory analysis

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