Journal
JOURNAL OF ECONOMIC ENTOMOLOGY
Volume 93, Issue 3, Pages 925-930Publisher
ENTOMOL SOC AMER
DOI: 10.1603/0022-0493-93.3.925
Keywords
European corn borer; Bacillus thuringiensis; resistance monitoring
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Two candidate diagnostic concentrations of the Cry1Ab and Cry1Ac toxins from Bacillus thuringiensis corresponding to the LC99 and EC99 (effective concentration that causes 99% growth inhibition) for European corn borer, Ostrinia nubilalis (Hubner), were determined based on previously obtained baseline data. Validation experiments using field-collected European corn borer populations from across North America showed that for Cry1Ab, a concentration corresponding to the upper limit of the 95% confidence interval of the LC99, produced mortality >99% for all populations tested. However, for Cry1Ac, adjustments and further validation are probably necessary. Development of B. thuringiensis resistance monitoring programs that rely on diagnostic techniques are discussed.
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