Biological Control of Cotton Caterpillar, Palpita indica Saunder (Lepidoptera: Pyralidae) with Entomopathogenic Nematodes

곤충병원성 선충을 이용한 목화바둑명나방(Palpita indica Saunder)의 생물적방제

  • 김형환 ;
  • 추호렬 ;
  • 박정규 ;
  • 이상명 ;
  • 추영무
  • Published : 2001.09.01

Abstract

Entomopathogenic nematodes were effective in the control of the cotton caterpillar, Palpita indica Saunder. P. indica mortality was significantly different depending on nematode species, treatment concentration, and instar. S. carpocapsae Pocheon strain was more effective against P. indica than S. glaseri Dongrae strain, S. longicaudum Nonsan strain, Heterorhabditis sp. Gyeongsan isolate, and H. bacteriophora Hamyang strain. When S. carpocapsae was treated with the rate of > 20 infective juveniles (ijs)/larva, mortality was ca. 100% at the 1st-4th instars of P. indica in 72h. $LC_{50}$ of entomopathogenic nematodes were significantly different depending on nematode species. The lowest $LC_{ 50}$ value was obtained by S. carpocapsae with 4.9-8.2 ijs in the 1st-prepupa while the highest $LC_{50}$ by Heterorhabditis sp. with 5.5-21.9 ijs, the shortest LT$_{50}$ value of P. indica was induced by S. carpocapsae when 20 ijs/larva were inoculated. The $LT_{50}$ s were 3.4-9.2h against the 1st-prepupa. The mortality of P. indica in fields was significantly different depending on field condition, nematode concentration, and leaf location. Mortality of P. indica by S. carpocapsae was higher at greenhouse,$ 3$\times$10^{9}$ ijs/ha and upper leaves than at field, 1$\times$10$^{9}$ ijs/ha and lower and middle leaves, respectively.

Keywords

Steinernema carpocapsae;S. glaseri;S. longicaudum;Heterorhabditis sp.;H. bacteriophora;LC$_50$;LT$_50$