This paper presents the characteristics of hibernation of pink rice borer. Results from the laboratory and field experiments carried out in 1980 to 1981 showed that in the south of Jiansu province pink rice borer could overwinter only at the larval stage from the second instar to the sixth instar. The resistance of larvae to the cold conditions increased as they grew into the older and depended upon an decrease in the environmental temperature. The larvae could survive the supercooling temperature for a rel...