Why haven’t you defeated the Colorado potato beetle yet?

Colorado beetles (potato leaf beetles) brought to us from the USA have taken root and adapted quite well here. They multiply very quickly, and since Colorado beetles do not have natural enemies, it is very difficult to destroy them. There are insects in the United States that kill the Colorado potato beetles. These are the perillus bug, the podizus bug, the lebia ground beetle, the dorophagus fly. Scientists have tried to reproduce these insects in laboratory conditions in order to reduce the number of the Colorado potato beetle, but due to the cold climate, these insects, unfortunately, do not take root.