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1 June 2000 Development of Diagnostic Concentrations for Monitoring Bacillus thuringiensis Resistance in European Corn Borer (Lepidoptera: Crambidae)
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Abstract

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 (Hübner), 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.

Paula C. R G. MarÇon, Blair D. Siegfried, Terence Spencer, and W. D. Hutchison "Development of Diagnostic Concentrations for Monitoring Bacillus thuringiensis Resistance in European Corn Borer (Lepidoptera: Crambidae)," Journal of Economic Entomology 93(3), 925-930, (1 June 2000). https://doi.org/10.1603/0022-0493-93.3.925
Received: 17 May 1999; Accepted: 1 February 2000; Published: 1 June 2000
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