Every lychee growing area around the world that this mite has spread and gained a foothold they have stayed permanently if not eradicated immediately at the source. They were in Florida many years ago but were eradicated immediately at the source and didn't spread around the state. This time the mite spread throughout all of Pine Island and the island nursery trees and fruit were sold to various locations around the state before quarantine went into effect. Even if the department is willing to treat commercial groves there are other groves and homeowners trees they aren't treating. I think it's here to stay. Typical treatment is to spray sulfur each growth flush at proper intervals as the leaves mature.