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Cohorts of European corn borer, OstTinia nubttaUs (Hiibner), from eggs infested on whorl-stage corn (Zea mays L.), were intensively sampled through fourth instar in 1986 and through fifth instar in 1987. In both years, central plants in plots (4 by 2 m, 55 plants) were infested with European corn borer egg masses to simulate a first-generation infestation. In 1986, one egg mass was placed in each plot, whereas in 1987, plots received one, two, or four egg masses. In both years, >50% of the recovered larvae were on the infested plant. Mean dispersal distance increased linearly with time in both years. However, maximum dispersal distance was independent of time in both years. In 1987, egg mass density had a significant linear effect on maximum dispersal distance but no effect on mean dispersal distance. The radius encompassing 90% of the recovered larvae included the infested plant and two plants on either side within the same row. Mortality occurred mainly within the first 48 h: 75.7% in 1986 and 82.9% in 1987. A logistic regression showed that egg and larval survival were independent of egg mass density. The number of tunnels produced per larva found at 8 d after infestation (considered equivalent to scouting) was 0.592. Knowledge of European corn borer dispersal and survival could be used to improve sampling plans and the calculation of economic thresholds.
Document Type: Research Article
Publication date: June 1, 1990
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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.