The APLC may undertake control of the Australian plague locust in areas to the west of the red line shown on the map below. The line was defined by former shire boundaries. It currently follows the eastern boundary of Goondiwindi, Dalby and Central Highlands Regional Councils. It passes through and follows parts of the boundaries of Toowoomba, Banana and Isaac Regional Council areas.
The boundary was originally defined as running north along the southern boundary of Inglewood Shire, and the eastern boundaries of Millmerran, Wambo, Chinchilla, Taroom, Bauhinia, Emerald and Peak Downs Shires.