Species and Occurrence Dynamics of Larval and Pupal Parasitoids of Two Rice Leaffolders in Qianwei County,Sichuan Province
The aim of this study is to clarify the differences in larval and pupal parasitic wasp species and dominant parasitic wasp species between Cnaphalocrocis exigua and Cnaphalocrocis medinalis so as to provide theoretical basis for the study of interspecific competition mechanisms and biological control of these two species.Parasitic wasp species were identified and natural parasitism were recorded from the wasps emerging from the larvae and pupae of these two species collected in Qianwei County,Sichuan Province and then reared in laboratory.The results showed that there were eight main parasitic wasp species in the larvae and pupae of C.exigua and C.medinalis.Among them,the wasp species emerged from both species was Phaeogenes sp.The wasp species found only from C.exigua included Brachymeria excarinata(Gahan,1925),Eurytoma verticillata(Fabricius,1798),Trathala flavo-orbitalis(Cameron,1907),Casinaria pedunculata(Szépligeti,1908),and Dimnockia secunda(Crawford,1910).Those emerged only from C.medinalis were Goniozus sp.and Eriborus terebrans.The parasitism rate of C.exigua(0.01%―0.46%)was lower than that of C.medinalis(0.34%―2.07%).E.terebrans was a dominant wasp species parasitizing C.medinalis with the highest dominance index,but B.excarinata was the dominant species parasitizing C.exigua with the highest dominance index.The dominant parasitic wasp species of C.exigua changed with seasons,being B.excarinata in July and September but being Phaeogenes sp.Trathala flavo-orbitalis in August.No parasitic wasps were found in C.exigua collected in October.This study indicates that although C.exigua and C.medinalis are related species,there are differences in the parasitic wasp species and dominant parasitic wasps between these two species.
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