Frequency of resistance to Bacillus thuringiensis toxin Cry1Ab in southern United States Corn Belt population of European corn borer (Lepidoptera: Crambidae).
J Econ Entomol
; 99(2): 502-7, 2006 Apr.
Article
em En
| MEDLINE
| ID: mdl-16686153
ABSTRACT
The high-dose refuge resistance management strategy is the main approach used to delay resistance in targeted pests to Bacillus thuringiensis (Bt) toxins in transgenic crops. We used an F2 screen to test a critical assumption of the high-dose refuge strategy, which is that resistance allele (R) frequencies are initially rare (<10(-3)) in Ostrinia nubilalis (Hübner) (Lepidoptera Crambidae) from the southern Corn Belt. We expanded the methodological scope of the F2 screen so that both males and females may be used to initiate a screen and determined how the results from both sexes may be combined. In total, 62 female and 131 male O. nubilalis lines from Kansas and 39 female and four male lines from Texas were screened. No major resistance alleles were found and estimated R frequency for the southern Corn Belt was updated to between 0 and 0.0044 with 95% credibility. The experiment-wise detection probability was 98.7%. These results suggest the frequency of resistance alleles is low enough that the high-dose refuge resistance management strategy may be effective for delaying resistance evolution in O. nubilalis to Bt corn in the southern Corn Belt.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Bactérias
/
Toxinas Bacterianas
/
Resistência a Inseticidas
/
Endotoxinas
/
Proteínas Hemolisinas
/
Inseticidas
/
Mariposas
Limite:
Animals
País/Região como assunto:
America do norte
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article