Native to Asia, box tree moth (BTM) ((Cydalima perspectalis) (Walker, 1859)) is an invasive pest first confirmed in Ontario in 2018. Determining the dispersal of BTM across southern Ontario, biology under Ontario’s climatic conditions and the potential use of plant species besides boxwood (Buxus spp.) as hosts by BTM, were top priorities for the development of an integrated pest management program. Between 2019–2021, BTM was documented in additional locations beyond the original detection site, most notably in the Niagara region, and the presence of two generations occurring between May and September was confirmed. Using choice and no-choice feeding experiments, results demonstrated that two Euonymus species, E. alatus and E. fortunei are not suitable hosts for BTM survival or development. Feeding attempts were made on each Euonymus spp., but in such insignificant amounts the action was exploratory and negligible by way of providing sustenance.