Larval Development of Spodoptera exigua (Lepidoptera: Noctuidae) Larvae on Artificial Diet and Cotton Leaves Containing a Bacillus thuringiensis Toxin: Heritable Variation to Tolerate Cry1Ac

Authors

  • D. V. Sumerford

Abstract

Studies were conducted to determine if beet armyworms, Spodoptera exigua (Hübner), possess the genetic variation necessary to respond to selection for improved tolerance of the Bacillus thuringiensis Berliner (Bt) toxin Cry1Ac. Spodoptera exigua individuals that pupated earliest when fed the Cry1Ac diet (ca. the first 20% to pupate) produced offspring that developed significantly faster on the Cry1Ac diet than their parental-control strain. In addition, after two generations of selection, the selected population reached pupation 2 d faster than the Parental population. The selected group also developed significantly faster on transgenic-Bt cotton leaves (cv. NuCOTN 33B) than the Parental strain. Individuals selected to more rapidly develop on media containing Cry1Ac developed no more rapidly on artificial diet containing Cry2Aa than the parental, control colony of S. exigua.

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Published

2003-09-01

Issue

Vol. 86, No. 3 (September 2003)

Section

Literature Review Articles

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