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Member Symposium

Plant-Insect Ecosystems

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Bridging Generations: Celebrating 50 Years of Innovative Biocontrol Programs in California & Beyond

Overwintering in California: A continued look at Trissolcus japonicus resilience

Sunday, November 9, 2025

11:25 AM - 12:00 PM Pacific

Location: Oregon Convention Center, Portland Ballroom 253, OCC

Presenting Author(s)

DR

Daniel Roberts

Pest Prevention Assistant III
California Department of Food and Agriculture
Citrus Heights, California

Co-Author(s)

VM

Vincent Maiquez

California Department of Food and Agriculture
Sacramento, California
RL

Ricky Lara

Senior Environmental Scientist
California Department of Food and Agriculture
Sacramento, California

Trissolcus japonicus is the lead natural enemy used in the classical biocontrol of the invasive polyphagous brown marmorated stink bug (BMSB), Halyomorpha halys. Since the first detection in the state of an adventive population of T. japonicus in 2017-2018, the California Department of Food and Agriculture has worked to rear the parasitoid with the intent of mass releasing in hotspots of BMSB activity. To facilitate the establishment of T. japonicus at target locations, a two-year study was begun in 2024 on the overwintering survival and post-overwintering fecundity of the parasitoid under temperate conditions. Included here are the results of this study, and the inferences which can be made from them.