Responses of Three Strains of Diamondback Moth, Plutella xylostella (L) on Bacillus thuringiensis var. aizawai and Fipronil

Idris Abd. Ghani, A. K. Husaan, M. T. Siti Hajar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Responses of three different strains (resistance, susceptible and cross strains) of diamondback moth (DBM), Plutella xylostella L. on Bacillus thuringiensis var. aizawai (Bta) and fipronil were studied. Results showed that mortality of DBM larvae of all strains generally decrease with concentrations of the insecticides solutions. However, larval mortality seemed to be higher when treated with fipronil than with Bta. The LC50 value for the susceptible strain treated with Bta (0.00083 ppm) was significantly lower than that of fipronil (0.00124 ppm). In contrast, the LC50 for resistance strain treated with Bta (0.03702 ppm) was significantly higher than with fipronil (0.00112 ppm), indicating that DBM populations of Karak farm have been exposed to Bta longer than to fipronil. Similarly, the cross strain treated with Bta had a significantly higher LC50 value (0.00174 ppm) than that of fipronil (0.00078 ppm). This suggests that the mechanism of resistance of DBM larvae to Bta and fipronil is different and that it could be controlled by different set of gene loci. The use of Bta alternated with fipronil in the field with minimal cross-resistance development among DBM population is discussed.

Original languageEnglish
Pages (from-to)113-117
Number of pages5
JournalJournal of Asia-Pacific Entomology
Volume7
Issue number1
DOIs
Publication statusPublished - Feb 2004

Fingerprint

fipronil
Plutella xylostella
Bacillus thuringiensis
lethal concentration 50
insect larvae
cross resistance
resistance mechanisms
insecticides
farms
loci

Keywords

  • Bacillus thuringiensis,
  • diamondback moth
  • fipronil
  • insecticides
  • resistance

ASJC Scopus subject areas

  • Insect Science

Cite this

Responses of Three Strains of Diamondback Moth, Plutella xylostella (L) on Bacillus thuringiensis var. aizawai and Fipronil. / Abd. Ghani, Idris; Husaan, A. K.; Siti Hajar, M. T.

In: Journal of Asia-Pacific Entomology, Vol. 7, No. 1, 02.2004, p. 113-117.

Research output: Contribution to journalArticle

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