ausblenden:
Schlagwörter:
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Zusammenfassung:
The cotton bollworm, Helicoverpa armigera (Hu¨bner) is one of the most serious insect pest
species to evolve resistance against many insecticides from different chemical classes. This
species has evolved resistance to the pyrethroid insecticides across its native range and is
becoming a truly global pest after establishing in South America and having been recently
recorded in North America. A chimeric cytochrome P450 gene, CYP337B3, has been identified
as a resistance mechanism for resistance to fenvalerate and cypermethrin. Here we
show that this resistance mechanism is common around the world with at least eight different
alleles. It is present in South America and has probably introgressed into its closely
related native sibling species, Helicoverpa zea. The different alleles of CYP337B3 are likely
to have arisen independently in different geographic locations from selection on existing
diversity. The alleles found in Brazil are those most commonly found in Asia, suggesting a potential origin for the incursion of H. armigera into the Americas.
