The Mexican rice borer has expanded its range from the Southwestern United States throughout Mexico during the early 20th century. It expanded into Texas in 1980 where it emerged as a key pest of sugarcane and rice. It's expansion northward and eastward the Gulf Coast was carefully monitored from 1980 to today. Subsequent introductions into Florida and Georgia were detected in 2012 and 2020, respectively. Potential influences of E. loftini expansion on populations genetic trends are discussed.