›› 2015, Vol. 58 ›› Issue (11): 1237-1244.doi:

• RESEARCH PAPERS • Previous Articles     Next Articles

Influence of parasitism at different host stages on the developmental performance of both the parasitoid Haplogonatopus apicalis (Hymenoptera: Dyrinidae) and its host Sogatella furcifera (Hemiptera: Delphacidae)

LI Shuai, CHEN Wen-Long, JIN Dao-Chao*   

  1. (Provincial Key Laboratory for Agricultural Pest Management of Mountainous Region of Guizhou University, The Provincial Special Key Laboratory for Development and Utilization of Insect Resources, Institute of Entomology of Guizhou University, Guiyang 550025, China)
  • Online:2015-11-20 Published:2015-11-20

Abstract: 【Aim】 In order to understand the interaction between the parasitoid Haplogonatopus apicalis and its host white-backed planthopper (WBPH), Sogatella furcifera, the effects of parasitism on the developmental performance of both H. apicalis and S. furcifera were studied. 【Methods】 Developmental time of S. furcifera nymphs parasitized at different instars and developmental duration from egg to adult of H. apicalis in different instars of S. furcifera nymphs were observed at 25℃ in the laboratory. 【Results】 The developmental durations of the 2nd, the 3rd, the 4th, or the 5th instar nymphs of the host S. furcifera were significant prolonged when they were parasitized by H. apicalis wasps. When the hosts were parasitized at the 2nd and the 3rd instars, the eclosion rates of S. furcifera adults were 54.29% and 60.95%, respectively, which were much lower than those parasitized at the 4th and the 5th instars (96.20% and 100%, respectively). The generation time of H. apicalis parasitizing on the 5th instar nymphs of the host (23.77 d) was obviously shorter than that of the parasitoids parasitizing on the 2ndinstar nymphs (27.77 d). The parasitoid showed the highest eclosion rate (56.19%) when the parasitism was at the 3rd instar nymphal stage of the host, and the highest male adult proportion (77.12%) when the parasitism was at the 5th instar nymphal stage of the host. 【Conclusion】 The developmental duration of S. furcifera nymphs is obviously delayed by parasitization of H. apicalis. The 2nd and the 3rd instar nymphs of S. furcifera are the optimum host stages for H. apicalis.

Key words: Sogatella furcifera, Haplogonatopus apicalis, host stage, developmental duration, eclosion rate, sex ratio