Journal of Insect Science (2019) 19 (4 - 15)

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Joshua M. Milnes and Elizabeth H. Beers (2019)
Trissolcus japonicus (Hymenoptera: Scelionidae) causes low levels of parasitism in three North American pentatomids under field conditions
Journal of Insect Science 19 (4 - 15)
Abstract: Trissolcus japonicus (Ashmead), an Asian parasitoid of Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), was first detected in North America in 2014. Although testing in quarantine facilities as a candidate for classical biological control is ongoing, adventive populations have appeared in multiple sites in the United States, Canada, and Europe. Extensive laboratory testing of T. japonicus against other North American pentatomids and H. halys has revealed a higher rate of parasitism of H. halys, but not complete host specificity. However, laboratory tests are necessarily artificial, in which many host finding and acceptance cues may be circumvented. We offered sentinel egg masses of three native pentatomid (Hemiptera: Pentatomidae) pest species (Chinavia hilaris (Say), Euschistus conspersus Uhler, and Chlorochroa ligata (Say)) in a field paired-host assay in an area with a well-established adventive population of T. japonicus near Vancouver, WA. Overall, 67% of the H. halys egg masses were parasitized by T. japonicus during the 2-yr study. Despite the 'worst case' scenario for a field test (close proximity of the paired egg masses), the rate of parasitism (% eggs producing adult wasps) on all three native species was significantly less (0.4–8%) than that on H. halys eggs (77%). The levels of successful parasitism of T. japonicus of the three species are C. hilaris > E. conspersus > C. ligata. The potential impact of T. japonicus on these pentatomids is probably minimal.
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Full text of article
Database assignments for author(s): Elizabeth H. Beers

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Euschistus conspersus U.S.A. (NW)
Chinavia hilaris U.S.A. (NW)
Chlorochroa ligata U.S.A. (NW)
Halyomorpha halys U.S.A. (NW)
Trissolcus japonicus (parasitoid) Euschistus conspersus U.S.A. (NW)
Trissolcus japonicus (parasitoid) Chinavia hilaris U.S.A. (NW)
Trissolcus japonicus (parasitoid) Chlorochroa ligata U.S.A. (NW)
Trissolcus japonicus (parasitoid) Halyomorpha halys U.S.A. (NW)