I actually think we are one of the last countries and AQIS is very strict on green bean imports for that reason.
Talking to farmers on the ground in Costa Rica I was told that the borer is fairly easy to control. The trick was to remove all the fruit at the end of the season giving them nothing to eat between seasons. Apparently the borer still comes back at the height of every season but in small numbers.
Leaving old and rotting cherry around adds to the problem so with good farm management they don't need insecticides to keep it in check.