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ViewAttendees 19

P-IE

Student Competition 10-Minute Paper

Grad 10-min: P-IE, Biocontrol 1

Dispersal and parasitism rates of the samurai wasp, Trissolcus japonicus, an adventive egg parasitoid of the invasive brown marmorated stink bug, Halyomorpha halys, in Oregon

On-Demand
Student Competition On-Demand
The brown marmorated stink bug, Halyomorpha halys, is a rapidly-spreading, polyphagous and invasive pest that has caused millions of dollars of economic damage in US specialty crops and is an increasing problem in the Pacific Northwest. In the home range of H. halys, the samurai wasp (Trissolcus japonicus) is known to be an efficient parasitoid of the pest, with very high parasitism rates of H. halys eggs ( >90%). As of 2020, Oregon State University has redistributed the adventive agent at sites across four ecoregions in Oregon with more releases in progress. In 2018 and 2019, we placed sentinel egg masses of H. halys and yellow sticky cards at release sites to assess establishment of T. japonicus populations in urban, agricultural, and riparian habitats in various locations around the state of Oregon and repeated the experiment with just the sticky cards in 2020. We collected the egg masses 5-7 days after release, while sticky cards were gathered 7-14 days after placement. We also collected wild egg masses of H. halys and assessed them for parasitism by T. japonicus. Here, we present the parasitism rates of both the sentinel and wild egg masses, as well as the locations in Oregon where T. japonicus were captured by the yellow sticky cards.