Seed Mixtures as a Resistance Management Strategy for European Corn Borers (Lepidoptera: Crambidae) Infesting Transgenic Corn Expressing Cry1Ab Protein

Authors: Davis, Paula M.; Onstad, David W.

Source: Journal of Economic Entomology, Volume 93, Number 3, June 2000 , pp. 937-948(12)

Publisher: Entomological Society of America

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Dispersal of neonate European corn borers, Ostrinia nubilalis (Hübner), in seed mixtures of transgenic corn expressing Cry1Ab protein (Bt+) and nontransgenic corn (Bt−) was evaluated in a 2-yr field study. The main objective was to determine if larval dispersal limits the effectiveness of seed mixtures as a resistance management strategy. Mixtures evaluated included (1) all Bt+ plants, (2) every fifth plant Bt− with remaining plants Bt+, (3) every fifth plant Bt+ with remaining plants Bt−, and (4) all Bt− plants. The transformation events MON 802 (B73 BC1F2 × Mo17) and MON 810 (B73 BC1F1 × Mo17), which express the Cry1Ab endotoxin isolated from Bacillus thuringiensis subsp. kurstaki, were used as the sources of Bt+ seed in 1994 and 1995, respectively (YieldGard, Monsanto, St. Louis, MO). At corn growth stage V6-V8, subplots within each mixture (15–20 plants each) were infested so that every fifth plant in mixtures 1 and 4, every Bt− plant in mixture 2, and every Bt+ plant in mixture 3 received two egg masses. Larval sampling over a 21-d period indicated increased neonate dispersal off of Bt+ plants, reduced survival of larvae that dispersed from Bt+ plants to Bt− plants, and a low incidence of late-instar movement from Bt− plants to Bt+ plants. Computer simulations based on mortality and dispersal estimates from this study indicate that seed mixtures will delay the evolution of resistant European corn borer populations compared with uniform planting of transgenic corn. However, resistant European corn borer populations likely will develop faster in seed mixes compared with separate plantings of Bt and non-Bt corn.

Keywords: Cry1Ab protein; Ostrinia nubilalis; resistance management; transgenic corn

Document Type: Research Article


Publication date: June 1, 2000

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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