On the other hand, the box tree moth seems to be doing fine - to the dismay of many gardeners. And boy oh boy can they ravage boxwood hedges. Unfortunately, insecticides are the only effective option in Europe and America. In Asia (where it's native) there are some natural predators, so the damage is limited. Birds aren't interested in the caterpillars. Some types of hornets are, but introducing them into non-native habitat brings other problems.

Hotter than normally springs and falls don't help either; the moth thrives in the warmer weather and can go through as many as four cycles (generations) during a single year.

https://www.invasivespeciesinfo.gov/terrestrial/invertebrate...

https://www.aphis.usda.gov/plant-pests-diseases/box-tree-mot...