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Discovery of Trissolcus japonicus (Hymenoptera: Scelionidae) in Ontario, Canada

Published online by Cambridge University Press:  30 September 2019

Tara D. Gariepy*
Agriculture and Agri-Food Canada, London Research and Development Centre, 1391 Sandford Street, London, Ontario, N5V 4T3, Canada
Elijah J. Talamas
Division of Plant Industry, Florida Department of Agriculture and Consumer Services, 1911 SW 34th St., Gainesville, Florida, 32608, United States of America
1Corresponding author (e-mail:


We report the detection and adventive establishment of the samurai wasp, Trissolcus japonicus (Ashmead) (Hymenoptera: Scelionidae), a candidate classical biological control agent for the invasive Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), in southwestern Ontario, Canada. Nine naturally laid, field-collected pentatomid egg masses were collected in 2017 and 2018, and two of these egg masses, belonging to Halyomorpha halys and Podisus maculiventris (Say) (Hemiptera: Pentatomidae), produced adults of T. japonicus. The identification of T. japonicus was confirmed using DNA barcoding as well as morphological characteristics. The remaining egg masses yielded adults of the native Telenomus podisi Ashmead (Hymenoptera: Platygastridae) and Anastatus reduvii (Ashmead) (Hymenoptera: Eupelmidae).

Insect Management-NOTE
© Entomological Society of Canada 2019. Parts of this are a work of Her Majesty of Queen in Right of Canada 

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Subject editor: Jon Sweeney


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