BSMB affects fruit - our apple export industry would be devastated as countries would no longer want to buy our apples, in case we gave them BSMB.
Your house could also be covered in stinky brown stink bugs - so many that you'd be sweeping them up in buckets! That's if these stinky pests were in New Zealand. They have been detected in New Zealand, probably arriving via cargo. Eradication has been successful so far, but we need to make sure a breeding population never establishes in NZ.
Check your bags before you arrive in NZ. If you see a large brown stink bug that you suspect to be BSMB, catch it and call the exotic pest and disease hotline 0800 80 99 66.