Pest Management Science (2000) 56, 743-748

Ali H. Sayyed, Juan Ferre and Denis J. Wright (2000)
Mode of inheritance and stability of resistance to Bacillus thuringiensis var kurstaki in a diamondback moth (Plutella xylostella) population from Malaysia
Pest Management Science 56 (9), 743-748
Abstract: Genetic inheritance of resistance to Bacillus thuringiensis var kurstaki (BTK) was examined in a diamondback moth (Plutella xylostella) population collected from the Melaka region of Malaysia. A BTK-selected sub-population (BTK-SEL) which was more than 100-fold resistant to BTK compared with a susceptible (ROTH) population of P xylostella was used with standard reciprocal crosses and back-crosses between ROTH and BTK-SEL. Logit regression analysis of F ₁ reciprocal crosses indicated that BTK resistance was inherited as an incompletely recessive autosomal trait and controlled by a single locus. In contrast, other studies have shown that resistance to Cry1Ac is inherited as an incompletely dominant autosomal trait in a Cry1Ac-selected sub-population of the same Melaka population. The frequency of the allele responsible for resistance decreased without exposure to insecticide in the laboratory.
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Database assignments for author(s): Ali H. Sayyed, Juan Ferre, Denis J. Wright

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
pesticide resistance of pest
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plutella xylostella		Malaysia
Bacillus thuringiensis var. kurstaki (entomopathogen)	Plutella xylostella		Malaysia
Bacillus thuringiensis Cry1A-toxin (entomopathogen)	Plutella xylostella		Malaysia