Interactions between Diglyphus isaea and Neochrysocharis formosa (Hymenoptera: Eulophidae), two parasitoids of agromyzid leafminers

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作   者：

Xuan, Jing-Li;  Liu, Wan-Xue;  Zhang, Yi-Bo;  Cheng, Xiao-Qin;  Guo, Jian-Yang;  Wan, Fang-Hao; 

作者机构：

State Key Lab Biol Plant Dis & Insect Pests;  Beijing 100193;  Chinese Acad Agr Sci;  Inst Plant Protect;  Peoples R China; 

关键词：

Host feeding;  Biological control;  Host-density effect;  Sympatry;  Coexistence; 

期刊名称：

Biological Control: Theory and Application in Pest Management

i s s n：

1049-9644

年卷期：

2018 年 126 卷

页   码：

45-52

页   码：

摘   要：

When two parasitoids exploit a common host simultaneously, competitive interactions between them usually occur, and are more complex among host-killing species. Diglyphus isaea (Walker) and Neochrysocharis formosa (Westwood) are larval parasitoids of agromyzid leafminers. They have widespread distributions and share the same host resources when sympatric. In this study, interactions between these two parasitoids and different parasitoid release modes were investigated. Parasitoids were exposed to leaves infested with late second to early third instar Liriomyza sativae at two different host densities in Petri dishes. The total death rate of N. formosa released alone was density-dependent. And release modes also impacted the total death rate of parasitoids at a high host density. However, the oviposition number of D. isaea was significantly greater than that of N. formosa when they coexisted. In addition, host-feeding proportions were greatest among three host-killing behaviors: parasitism, host feeding and host stinging. These results contribute to a further understanding of parasitoids' host-killing strategies.