The yellow stem borer or rice yellow stem borer (Scirpophaga incertulas) is a species of moth of the Crambidae family. It is found in Afghanistan, Nepal, north-eastern India, Sri Lanka, Bangladesh, Burma, Vietnam, Thailand, Malaysia, Singapore, Sumatra, Java, Borneo, Sumba, Sulawesi, the Philippines, Taiwan, China and Japan. The wingspan is 24–36 mm. Adult males are smaller than female. The forewings are gray or light brown and have two rows of black spots at the tip.