Cold hardiness of Spodoptera litura Fabricius (Lepidoptera: Noctuidae)

담배거세미나방(Spodoptera litura Fabricius)의 내한성

  • 김용균 (안동대학교 자연과학대학 생명자원과학부 곤충생리실) ;
  • 박형근 (안동대학교 자연과학대학 생명자원과학부 곤충생리실) ;
  • 송원례 (안동대학교 자연과학대학 생명자원과학부 곤충생리실)
  • Published : 1997.09.01

Abstract

Supercooling points (SCP) and cold tolerance of the tobacco cutworm, Spodol~rera litura Fabricius. were measured in response to subzero temperatures. SCPs were varied among developmental stages. Eggs showed the lowest SCP (-27$^{\circ}$C). Pupae and adults had the intermediate SCP(- 18$^{\circ}$C). The SCPs (- I0 to - 16$^{\circ}$C) of larvae increased with their ages. Lethal low temperature of each stage was higher than its SCP. Preexposure of eggs and larvae to a sublethal low temperature increased their survival capacities under lethal low temperatures. The sublethal temperature also induced the fifth instar larvae to increase hemolymph osmolality and to produce cold-induced proteins of apparent molecular weights of 20 and 27 kD. These results indicate that this species is classified into a freeze-susceptible insect.