Stem borers are caterpillars that live in rice stems. They eventually turn into yellow or brown moths; usually one larva occurs per tiller. Moths are active at night. A female can lay up to three egg masses during her 7 to 10 day life as an adult. Egg masses of yellow stem borers are disc-shaped and covered by a light brown mat of hair from the female abdomen. Each egg mass contains about 100 eggs.
