In 2020, a 100-hectare rice paddy area in Guanshan Township, Taitung County, transitioned to organic cultivation. After three cropping seasons, the rice black bug (RBB) (Scotinophara lurida) population surged, causing significant yield losses for farmers, with some experiencing up to 90% losses and an average loss exceeding 30%. The Taitung District Agricultural Research and Extension Station (TTDARES) has isolated a highly virulent strain of the entomopathogenic fungus (Metarhizium anisopliae), strain TDMA01, which has been deposited in a patent strain collection. Field trials conducted with regulatory approval have confirmed that TDMA01 effectively controls RBBs, infecting both adults and nymphs, and leading to a significant increase in yield. Two field demonstration events have been held to showcase the efficacy of this biocontrol agent. The TDMA01 strain holds great promise for development as a microbial pesticide.