| Summary: | The brown marmorated stink bug, <i>Halyomorpha halys</i> (Stål) (Hemiptera: Pentatomidae), is native to northeast Asia. It was accidentally introduced to Europe and North America, where it has become a key pest, feeding on many important crops. Previous eco-climatic niche modelling indicates that <i>H. halys</i> could expand its distribution vastly, and numerous border interceptions of this pest in many countries, including Australia and New Zealand, indicate that it would be prudent to prepare for its eventual arrival. Similar niche modelling was used to assess the potential distribution of <i>Trissolcus japonicus</i> (Ashmead) (Hymenoptera: Scelionidae), the key parasitoid of <i>H. halys</i> in China. <i>Trissolcus mitsukurii</i> (Ashmead) is one of the main parasitoids of <i>H. halys</i> in Japan. It is known to have existed in Australia since the early 20th century and was also specifically introduced to Australia in the 1960s, and it has now also invaded Italy. We used CLIMEX to model the climatic niche of <i>T. mitsukurii</i> to estimate its global potential distribution. We found that <i>T. mitsukurii</i> should be able to significantly expand its range globally, and that there is a significant degree of overlap in the projected ranges of <i>T. mitsukurii</i>, <i>T. japonicus</i> and <i>H. halys</i>. From a biological control perspective, this implies that the two <i>Trissolcus</i> species may be able to help mitigate the potential impacts of <i>H. halys</i>.
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