Adventive populations of Trissolcus japonicus, an Asian natural enemy of Halyomorpha halys, in the USA

Tuesday, April 5, 2016
Grand Ball Room Foyer (Pacific Beach Hotel)
Angelita L. Acebes , Department of Entomology, Virginia Polytechnic Institute and State University, Winchester, VA
Elizabeth H. Beers , Entomology, Washington State University, Wenatchee, WA
Christopher Bergh , Department of Entomology, Virginia Polytechnic Institute and State University, Winchester, VA
Marie-Claude Bon , EBCL, USDA - ARS, Montferrier-sur-Lez, France
Matthew L. Buffington , USDA - ARS, Washington, DC
Mary Cornelius , Beltsville Agricultural Research Center, USDA - ARS, Beltsville, MD
Christine Dieckhoff , Beneficial Insects Introduction Research Unit, USDA - ARS, Newark, DE
Elizabeth L. Fread , Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA
Matthew Greenstone , Agricultural Research Service-Insect Biocontrol Lab, USDA - ARS, Beltsville, MD
Megan Herlihy , Invasive Insect Biocontrol & Behavior Laboratory, USDA - ARS, Beltsville, MD
Vincent Lesieur , European Biological Control Laboratory, USDA - ARS, Montferrier le Lez, France
Tracy C. Leskey , Appalachian Fruit Research Station, USDA - ARS, Kearneysville, WV
Ludovic Manaargadoo , European Biological Control Laboratory, USDA-ARS, Montpellier, France
Joshua Milnes , Entomology, Washington State University, Wenatchee, WA
William R. Morrison , Appalachian Fruit Research Station, USDA - ARS, Kearneysville, WV
Paula M. Shrewsbury , Department of Entomology, University of Maryland, College Park, MD
Elijah Talamas , USDA - ARS, Washington, DC
Kathy Tatman , Beneficial Insect Introduction Research Unit, USDA - ARS, Newark, DE
Rebeccah A. Waterworth , Department of Entomology, University of Maryland, College Park, MD
Donald C. Weber , Invasive Insect Biocontrol and Behavior Laboratory, USDA-ARS, Beltsville, MD
Nik G. Wiman , North Willamete Research and Extension Center, Oregon State University, Aurora, OR
Kim A. Hoelmer , Beneficial Insects Introduction Research Unit, USDA - ARS, Newark, DE
Egg parasitoids are a major source of mortality for Pentatomidae, including brown marmorated stink bug (BMSB, Halyomorpha halys). BMSB is now established throughout much of the U.S., and its Asian egg parasitoids are being evaluated as potential biological control agents in the U.S. to supplement the activity of native natural enemies. In 2014, during field studies at the ARS Beltsville Agricultural Research Center in Maryland to determine levels of BMSB egg parasitism by resident parasitoids in various habitats, an adventive (unknown mode of introduction) Asian parasitoid of BMSB, Trissolcus japonicus, was unexpectedly discovered in a deciduous wooded habitat. Other research teams in several eastern states that had also been monitoring BMSB natural enemy activity in crops and other habitats did not detect any T. japonicus in their surveys. For this reason, 2015 surveys were conducted by researchers in DE, MD, WV and VA using sentinel egg masses placed primarily on trees in similar wooded habitats. Multiple recoveries were made during the season at Winchester, VA, and Beltsville, MD. Single recoveries were made at the US National Arboretum (Washington DC) and at two MD tree nursery sites (the latter were not within initially-surveyed areas). Another unexpected finding during 2015 was the recovery of T. japonicus at a single site in Vancouver, WA, as a result of ongoing native egg parasitoid surveys in Oregon and southern Washington. Analyses showed that all 2014 and 2015 recoveries in MD and VA cluster together, whereas the 2015 WA recovery is distinct. None of the U.S. recoveries group with populations in quarantine culture. T. japonicus appears to have been introduced at least twice. Possible routes of entry include arrival in a parasitized egg mass on live plants or as hitchhiking adult wasps.
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