An assessment of interspecific competition between two introduced parasitoids of Diaphorina citri (Hemiptera:Liviidae) on caged citrus plants

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: Asian citrus psyllid classical biological control competition Diaphorencyrtus aligarhensis Tamarixia radiata
• 年，卷（期）: 2019,（1）
• 页码范围: 119-127
• 页数: 9页
• 语种: 英文
• DOI: 10.1111/1744-7917.12490

摘要

Two parasitoids attacking nymphs of Asian citrus psyllid,Diaphorina citri Kuwayama (Hemiptera:Liviidae),Tamarixia radiata (Waterston) (Hymenoptera:Eulophidae) and Diaphorencyrtus aligarhensis (Shafee,Alam & Agarwal) (Hymenoptera:Encyrtidae) are being released in California,USA in a classical biological control program.To evaluate the effect of multiple parasitoid species on D.citri mortality,we conducted mesocosm experiments under controlled conditions using a complete block design with 6 treatments (D.citri nymphs exposed to:no parasitoids;D.aligarhensis or T.radiata alone;D.aligarhensis or T.radiata released first (by 48 h);and both species released simultaneously).Parasitism of D.citri nymphs by T.radiata exceeded 60％ and was unchanged when D.aligarhensis were present.Parasitism by D.aligarhensis was greatest when T.radiata was absent (～28％) and was reduced in all treatments with T.radiata present (＜3％).D.citri mortality and parasitoid-related mortality ofD.citri was consistent across parasitoid treatments.Laboratory results suggest that competition between D.aligarhensis and T.radiata is asymmetric and favors T.radiata.It may be difficult for D.aligarhensis to contribute significantly to D.citri biological control where T.radiata is present.However,results reported here suggest that competition between T.radiata and D.aligarhensis is not likely to reduce parasitism by T.radiata or reduce parasitoid-induced mortality of D.citri.