Changes in susceptibility to conventional insecticides of a Cry1Ac-selected population of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)

The changes in the susceptibility of the cotton bollworm, Helicoverpa armigera (Hubner) to three insecticides (lambda-cyhalothrin, phoxim and endosulfan) commonly used for control of this pest in China were monitored by bioassays at various generations. The insects were originally collected from Bt...

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Bibliographic Details
Published in:Pest management science 2004-07, Vol.60 (7), p.680-684
Main Authors: Wu, K, Guo, Y
Format: Article
Language:English
Subjects:
Animals
Bacillus thuringiensis
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
Bacterial Toxins - genetics
Bacterial Toxins - metabolism
Biological and medical sciences
Biological Assay
Bt toxin
Control
Cotton
cyhalothrin
endosulfan
Endosulfan - toxicity
Endotoxins - genetics
Endotoxins - metabolism
Fundamental and applied biological sciences. Psychology
Gossypium
Gossypium hirsutum
H armigera
Helicoverpa armigera
Hemolysin Proteins
insect control
insect pests
insecticide
insecticide resistance
Insecticide Resistance - drug effects
Insecticides
Insecticides - toxicity
Insects
Lepidoptera - drug effects
mechanism of action
Nitriles
Noctuidae
Organothiophosphorus Compounds - toxicity
Pest control
phoxim
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
Pyrethrins - toxicity
resistance management
toxic substances
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Summary:The changes in the susceptibility of the cotton bollworm, Helicoverpa armigera (Hubner) to three insecticides (lambda-cyhalothrin, phoxim and endosulfan) commonly used for control of this pest in China were monitored by bioassays at various generations. The insects were originally collected from Bt cotton fields and selected with Cry1Ac over 44 generations. In comparison with a susceptible strain, the larval resistance of the Bt-selected populations to Cry1Ac toxin increased 106-fold. Simultaneously, the resistance levels to lambda-cyhalothrin, phoxim and endosulfan declined dramatically. The results indicated no positive cross-resistance between Cry1Ac toxin and the insecticides. Evidence of the lack of cross-resistance to three commonly used synthetic insecticides in our laboratory-derived Cry1Ac-resistant population may suggest that growers can confidently use these insecticides if and when resistance to Cry1Ac cotton does occur.
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.848