| Summary: | The spread of phytophagous pests are often associated with global warming. These species may be of interest in terms of biological indications of climate change. We considered the locust digitate leafminer <i>P. robiniella</i>. In Ukraine it was first recorded in 2003. In 2020–2021, we found areas of massive <i>R. pseudoacacia</i> leaf damage caused by the pest on Trukhaniv island (Kyiv) and some places in the region. Using 592 georeferenced records of <i>P. robiniella</i> across Europe and a Bayesian additive regression trees algorithm, we modeled the distribution of the moth. As predictors, a current climate (WorldClim v.2) and a black locust habitat suitability map were employed. Western and south-western regions of Ukraine and Transcarpathia are considered the most favorable for the pest. Amongst the factors determining its niche, summer moisture and warm conditions are the most important for facilitating the spread and naturalization of the moth. Under progressing climate change, the species is expected to move eastward.
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