Keep in mind, Nippy, that the natural food chain, ecosystems and climate are under considerable stress due to disruptive, human activities. This in turn causes species disruption - some thrive, some go extinct and some (hardy) mobile species move. Under a balanced system it is unlikely that said mite would have proliferated to become a significant problem as they have done in certain parts of the world, which allowed them to be imported. Everything in nature is connected, and when those connections are broken, there are detrimental ramifications, like said mites.
