Abstract: A non-toxic fire ant extermination system providing probe injection of scalding water below ground level within a fire ant mound is disclosed. The system includes a propane fueled water heater and water circulating pump capable of heating water in the range of 200 to 210 degrees Fahrenheit and of delivering the same at a flow rate of least three gallons per minute which is effective to eradicate the insects within the core region of a fire ant mound. The injection probe features a cylindrical capture shield which is radially disposed about the probe and adapted for sliding attachment therewith being spring-biased in a downward direction against the surface of the ground during operation thereof to retain the intense heat generated by the process,to capture fire ants emerging from the mound, and to protect the operator from the backflow of scalding water as the treatment proceeds.