Pathogenicity and Multiplication of Entomopathogenic Nematode, Steinernema carpocapsae Weiser, on Been Armyworm, Spodoptera exigua (Hubner) and Tobacco Cutworm, Spodoptera litura(Fabricius)

파밤나방(Spodoptera exigua (Hubner))과 담배거세미나방(Spodoptera litura(Fabricius))에 대한 곤충병원선충(Steinernema carpocapsae Weiser)의 감염력 및 증식력

  • 한상찬 (안동대학교 자연과학대학 생명자원과학부) ;
  • 이성섭 (안동대학교 자연과학대학 생명자원과학부) ;
  • 김용균 (안동대학교 자연과학대학 생명자원과학부)
  • Published : 1999.12.01

Abstract

Pathogenicity and multiplication of entomopathogenic nematode, Steinernema carpocapsae Weiser, ere analyzed in two insect hosts, Spodoptera exiga (Hubner) and Sp. litura(Fabricius). The estimated ${LC}^{50}s$(lethal concentration of the infective juveniles to kill 50% of the host insect population) were not different between tow insect species or among their developmental stages on the filter paper assay, thought the actual numbers of the infected nematodes were varied among them. The significant variation, however occurred in nematode multiplication between tow inset hosts. Temperature also gave sosignificatn effect on nematode multiplication rate that it took 6 days after infection at $25^{\circ}C$, but did 12 days at $20^{\circ}C$ to show the maximal nematode population peak($\approx$500,000 infective juveniles(IJ) in a 5th instar larva of Sp. litura and $\approx$-100,000 IJ in a 5th instar larva of Sp. exigua).