**5. Conclusions**

The collected data indicate that the box tree moth (*Cydalima perspectalis*) took over its entire area from its first discovery in 2012 in Poland in 2020. Insects have spread throughout the country, often over long distances, using major communication routes. Currently, it is the greatest threat to boxwood in southern and central Poland. The lack of nationwide monitoring of *C. perspectalis* makes it challenging to control its spread and combat it, especially in regions where it appears the first time. The developed coverage maps, together with the data on recording the presence of *C. perspectalis*, allow gardeners and plant breeders to analyze the situation on an ongoing basis and undertake adequate control and eradication methods.

**Supplementary Materials:** The following supporting information can be downloaded at: https: //www.mdpi.com/article/10.3390/d14010022/s1: Table S1: The number of places where the appearance of *Cydalima perspectalis* was recorded and the number of reports of insects in individual voivodeships, in 2018–2020; Table S2: Detailed list of places (towns) in which the occurrence of *Cydalima perspectalis* was recorded and confirmed in 2018–2020.

**Author Contributions:** P.K.B. and M.N. conceived and designed the experiments; Ł.K., M.G. and P.K.B. performed the experiments; M.A., M.N. and P.K.B. analyzed the data; M.N., P.K.B. and P.Z. wrote the paper. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** All data used in the publication are available at the WWW addresses of the links quoted. If there are no citation, the data used are not in any public database. Raw data on the presence of *C. perspectalis*, *O. nubilalis* and *D. virgifera* in Poland are available only in internal reports of the Institute of Plant Protection.

**Acknowledgments:** The authors would like to thank all the gardeners cooperating with the gardening site "Allotment and Garden Our Passion (DIONP)" for the data provided on the range of *C. perspectalis* occurrence in Poland in 2018–2020. We want to express special thanks to the owner of this gardening website, Beata Bere´s. We also thank Tomasz Konefał from the Main Inspectorate of Plant Health and Seed Inspection in Toru ´n for his help in the graphic development of maps of *C. perspectalis* occurrence range in Poland.

**Conflicts of Interest:** The authors declare no conflict of interest.
