Pest Management Science (2010) 66, 137-141

Joseph Achaleke and Thierry Brévault (2010)
Inheritance and stability of pyrethroid resistance in the cotton bollworm Helicoverpa armigera (Lepidoptera: Noctuidae) in Central Africa
Pest Management Science 66 (2), 137-141
Abstract: BACKGROUND: The cotton bollworm Helicoverpa armigera (Hübner) has developed esterase-mediated resistance to pyrethroids in Central Africa. To gain a better understanding of how quickly this resistance can evolve, its genetic basis and stability were examined in a field-derived strain of H. armigera (474-fold resistant to cypermethrin).
RESULTS: Genetic crosses between susceptible, resistant and F₁ hybrids indicated that resistance was inherited as a dominant trait (D_LD = 0.86) and conferred by a single autosomal gene. The dominance of resistance decreased as the cypermethrin dose increased, so that resistance was incompletely dominant (D_ML = 0.73) at the highest dose tested. Resistance (DL₅₀) of the F₁ hybrid progeny significantly decreased over five generations in the absence of pyrethroid exposure.
CONCLUSION: Rapid selection of resistance alleles due to dominance supports the ability of H. armigera to develop resistance to pyrethroids in Central Africa. However, associated fitness costs provide useful information for managing the evolution of resistance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Thierry Brevault

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa armigera		Cameroon