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Medientyp: E-Artikel Titel: Inheritance of resistance to Bt canola in a field‐derived population of Plutella xylostella Beteiligte: Sayyed, Ali H; Schuler, Tanja H; Wright, Denis J Erschienen: Wiley, 2003 Erschienen in: Pest Management Science Sprache: Englisch DOI: 10.1002/ps.754 ISSN: 1526-498X; 1526-4998 Schlagwörter: Insect Science ; Agronomy and Crop Science ; General Medicine Entstehung: Anmerkungen: Beschreibung: <jats:title>Abstract</jats:title><jats:p>Crops expressing <jats:italic>Bacillus thuringiensis</jats:italic> (<jats:italic>Bt</jats:italic>) insecticidal Cry proteins are grown on millions of hectares. Recommendations to delay resistance are based on a high expression/refugia strategy that aims to kill resistant heterozygotes and enable some susceptible insects to survive. Leaf‐dip bioassays on F1 crosses of Malaysian populations of diamondback moth (<jats:italic>Plutella xylostella</jats:italic> (L)) showed that Cry1Ac resistance was not fully recessive. The survival of <jats:italic>ca</jats:italic> 50% of heterozygotes on <jats:italic>Bt</jats:italic> canola (<jats:italic>Brassica napus</jats:italic> L) leaves expressing low concentrations of Cry1Ac agreed with a non‐fully‐recessive model for resistance. Extrapolations based on log dose‐logit mortality regressions for heterozygotes using leaf‐dip bioassays showed that a relatively high level of expression, of <jats:italic>ca</jats:italic> 2000 ng Cry1Ac mg<jats:sup>−1</jats:sup> total leaf protein, would be required to give 90% mortality to heterozygotes. If high enough levels of expression of <jats:italic>Bt</jats:italic> toxin to kill heterozygotes cannot be achieved and maintained under field conditions, the effectiveness of the high‐dose/refugia strategy would be reduced. Copyright © 2003 Society of Chemical Industry</jats:p>