Heritability and stability of resistance to Bacillus thuringiensis in Ostrinia nubilalis (Lepidoptera: Pyralidae)

Document Type

Article

Publication Date

1-1-1999

Abstract

Realized heritability, h2, of resistance in European corn borer, Ostrinia nubilalis (Hubner), to Bacillus thuringiensis Berliner ssp. kurstaki endotoxins was examined in five resistant laboratory colonies. These colonies were reared on a meridic diet that incorporated a commercial formulation of B. thuringiensis, Dipel ES. Resistance in these colonies reached 42-67x by the seventh to twentieth selected generations and then plateaued. The realized heritability of resistance averaged 0.17-0.31 over all selected generations for the five colonies. In the three Iowa colonies, the highest realized heritability, 0.18-0.33, occurred during the second period of selection (seventh to thirteenth selected generations). In the two Kansas colonies, the highest realized heritability, 0.36 and 0.46, occurred during the first period of selection (first to sixth selected generations). In the absence of selection pressure, resistance in the southwest Kansas colony decreased from 62x to 42x after two generations, and remained at about that level for the next five generations.

Publication Source (Journal or Book title)

Bulletin of Entomological Research

First Page

449

Last Page

454

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