JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6): 243-250.doi: 10.12302/j.issn.1000-2006.202207006

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Study on parasitic behavior of Pseudoxenos iwatai in the abdomen of Rhynchium quinquecinctum

SUN Kaili1(), HE Chunling1,*(), HU Junjie1, FAN Quanbo1, LUAN Ke2, REN Yingfeng2, XIAO Zhishu3   

  1. 1. College of Horticulture and Plant Protection, Henan University of Science & Technology, Luoyang 471000, China
    2. National Yugong Forestry Station of Jiyuan City, Jiyuan 459000, China
    3. State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2022-07-05 Revised:2023-03-24 Online:2023-11-30 Published:2023-11-23
  • Contact: HE Chunling E-mail:skl19930908@163.com;hechunling68@126.com

Abstract:

【Objective】Rhynchium quinquecinctum was collected by the nest trap method, and Pseudoxenos iwatai samples were reared in the laboratory. The parasitism rate, extrusion time and position, eclosion time, and other behaviors of P. iwatai in the abdomen of R. quinquecinctum were observed by visual observation, photography and videography. 【Result】The parasitism rate of P. iwatai on R. quinquecinctum was 5.85% and the sex ratio of P. iwatai was 1∶6.24. In R. quinquecinctum, 48.98% of females and 51.02% of males were parasitized. The number of P. iwatai parasites in the abdomen of R. quinquecinctum ranged from one to nine, of which one to three were the majority, accounting for 91.54% of the total. The extrusion positions from the abdomens of R. quinquecinctum differed between females and males, and the number of females was the highest in the 3rd-4th segments of the host abdomen, accounting for 40.91%, while it was the highest in the 4th-5th segments of the host abdomen in males, accounting for 65.83%. Males were found on the 1st to 9th day after the R. quinquecinctum eclosion, and the number on the 1st day was the largest, accounting for 66.67%. The number of females observed on the 5th day after eclosion was the highest, accounting for 67.44%. There was a clear attraction to the male after the cephalothorax of the female was extruded from the host’s abdomen, and the attraction peak was at 5:30-6:30 and 13:00-14:30 of the day. Male eclosion occurred on the 5th to 10th day after R. quinquecinctum closion, and the peaks of eclosion were between 5:00-6:30, 9:00-11:00, and 14:00-15:30 in the day.【Conclusion】Different extruding positions from the abdomen of R. quinquecinctum for different sexes of P. iwatai were observed. An important behavior in the reproductive mating strategy of P. iwatai may be the overlap of the time of attracting males by females extruding from R. quinquecinctum and the peak time of male eclosion.

Key words: Strepsiptera, Pseudoxenos iwatai, Rhynchium quinquecinctum, parasitism rate, extrude position, eclosion

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