Evaluation of the larvicidal effectof the essential oil of Zingiber officinale Roscoe (ginger) against the mosquito Aedes aegypti. This study analyzes the larvicidal effect of the oil of Zingiber officinale Roscoe against larvae in third stage of the mosquito Aedes aegypti (Linnaeus 1792). The essential oil was extracted quantitatively by hydrodistillation and we calculated the oil's LC 50 from Reed-Muench (1938) and Pizzi (1950) methods, respectively. The essential oil obtained LC 50 of 76.07 (±2.24) ug mL -1 , and yield of 0.52% m/v. The results indicate that the essential oil assessed has substances that provide larvicidal effect against Aedes aegypti.