Tuesday, 16 November 2004 - 9:24 AM

Monitoring for insect resistance in moderately susceptible target pests: Western bean cutworm, Richia albicosta Smith, susceptibility to Cry1F insecticidal protein

Steve A. Lefko, steve.lefko@pioneer.com1, Rachel R. Binning, rachel.binning@pioneer.com1, Bruce Stanley, bruce.h.stanley-1@usa.dupont.com2, and Tim Nowatzki, tim.nowatzki@pioneer.com1. (1) Pioneer Hi-Bred International, Inc, Trait and Technology Development, Stine Haskell Research Center 215, 1090 Elkton Rd, Newark, DE, (2) Dupont Crop Protection, Stine-Haskell Research Center, P.O. Box 30, Newark, DE

Western bean cutworm (WBCW) (Richia albicosta, Smith) is a secondary pest of corn in the western portion of the US corn belt. Economic loss from this ear-feeding pest is temporally and spatially sporadic across its distribution. Wide-area testing characterized Herculex I efficacy of this pest. Subsequently, the product use guide was amended to include WBCW and a voluntary stewardship plan was established. Herculex I plants provide very good efficacy against WBCW and preliminary laboratory bioassay data described susceptibility that was less than high-dose as defined by the FIFRA Scientific Advisory Panel (April 1998). This is not uncommon for secondary pests of corn products with lepidopteran protection using plant-incorporated-protectants. One aspect of the stewardship plan for Herculex I efficacy against WBCW includes a study of baseline susceptibility. These results will provide a benchmark for investigating suspected field resistance. Results from this two-year study are reported with an emphasis on alternate monitoring methods appropriate for target pests that are moderately susceptible to Bt proteins.

Species 1: Lepidoptera Noctuidae Richia albicosta (western bean cutworm)
Keywords: insect resistance

[ Recorded presentation ] Recorded presentation

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