Comparative Study of Toxicological Methods and Field Resistance to Insecticides in Diamondback moth(Lepidoptera: Plutellidae)

배추좀나방(Plutella xylostella L.)의 독성시험방법 비교와 지역별 약제저항성에 관한 연구

  • 이승찬 (전남대학교 농과대학 농생물학과) ;
  • 조영식 (전남대학교 농과대학 농생물학과) ;
  • 김도익 (전남대학교 농과대학 농생물학과)
  • Published : 1993.09.01


These studies were conducted to evaluate the five comparative test methods for detecting chemical resistance and to investigate resistant level of field populations of diamondback moth (Plutella xylostella L.). Leaf disc method was practically rocomrnendable because of its rapidity and low CV(l1.4%). Topical application method was a precise replicabiliLy(CV=8.00/0) but it was time consuming and difficult in mampulation. The other 3 methods showed higher CV ranging from 14.9% to 21.4%. Based on $LC_{50}$ values by topical application method, field populations of diamondback moth collected from 4 different regions, Kwangju, Kimhae, Jeju, and Inje to prothiofos showed from 3.3 to 61.1 times higher resistance than the susceptible strain, whereas to cypermethrin, Lhey were from 7.5 to 141.7 times higher than the susceptible. To cartap hydrochloride, they showed from 10.5- to 33.3-fold resistant levels as high as the susceptible. Finally, based on $LC_{50}$ values to Bacillus thuringiensis by leaf disc technique, the resistant levels of the field populations were from 1.9 Lo 8.1 times as compared to the susceptible.