Biocontrol implications of multiparasitism by Trissolcus mitsukurii and Trissolcus japonicus on the invasive brown marmorated stink bug

The egg parasitoids Trissolcus japonicus (Ashmead) and Trissolcus mitsukurii (Ashmead) (Hymenoptera: Scelionidae) are the most effective biocontrol agents of the invasive agricultural pest Halyomorpha halys (Stål) (Heteroptera: Pentatomidae) in its native range (east Asia). Trissolcus japonicus and...

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Bibliographic Details
Published in:Entomologia experimentalis et applicata 2022-09, Vol.170 (9), p.772-781
Main Authors: Costi, Elena, Di Bella, Emanuele, Iotti, Daniele, Maistrello, Lara
Format: Article
Language:English
Subjects:
Biological control
Competition
contest behaviour
egg parasitoids
Eggs
Halyomorpha halys
Hemiptera
Heteroptera
Hymenoptera
Invasive insects
natural antagonists
Orchards
parasitoid impact
Parasitoids
Pentatomidae
Pest control
Pests
Scelionidae
Species
Sympatric populations
Trissolcus japonicus
Trissolcus mitsukurii
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Summary:The egg parasitoids Trissolcus japonicus (Ashmead) and Trissolcus mitsukurii (Ashmead) (Hymenoptera: Scelionidae) are the most effective biocontrol agents of the invasive agricultural pest Halyomorpha halys (Stål) (Heteroptera: Pentatomidae) in its native range (east Asia). Trissolcus japonicus and T. mitsukurii are sympatric in the native areas. In northern Italy, where H. halys is a major pest of fruit orchards, adventive populations of both species are spreading, and T. japonicus is artificially released under a classical biocontrol program against H. halys. This laboratory study aimed to assess the outcome of competition when both species share the same resource and possible implications for the biological control of the invasive stink bug. Egg masses of H. halys were offered to each parasitoid after previous parasitization by the other species. Parasitoid behaviour, number of ovipositions, and successfully developed parasitoids were recorded. Additionally, contest behaviour was assessed when both species were released simultaneously on the same egg mass. Results showed that both T. japonicus and T. mitsukurii were able to parasitize an egg mass already parasitized by the other species. Competition occurred within the host eggs and each species outperformed the other when it was the first to oviposit. Importantly, the overall contribution to H. halys mortality was not affected by the interaction between parasitoids, as non‐parasitized eggs were 4–6% in the absence of competition and 
ISSN:0013-8703
1570-7458
DOI:10.1111/eea.13185