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Utah State University Extension

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The brown marmorated stink bug (BMSB, Halyomorpha halys Stål), an invasive insect from eastern Asia, is causing nuisance problems and agricultural damage in northern Utah. Insecticide applications to control this pest are not sustainable, and therefore the focus is on biological control through the use of parasitoid wasps that sting and kill stink bug eggs. Surveys are underway in Utah to search for Samurai wasp (Trissolcus Japonicus [Ashmead]), a parasitoid wasp native to BMSB’s home range that has been found in 12 U.S. States, and is highly effective at killing BMSB eggs. While Samurai wasp has not been found, surveys have revealed 11 species of native parasitoid wasps in two families that are potentially contributing to the biological control of BMSB in Utah. Surveys will continue to search for Samurai wasp. If found, it can be reared and redistributed to assist with the biological control of BMSB. We herein review the different groups of wasps attacking BMSB in Utah, and offer identification characteristics and survey methods to better monitor for parasitoid wasps in the field.



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