Effect of Corn Row Spacing and of Plant Populations on Establishment and Control of the European Corn Borer1,2,3

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In 11 field tests at Ankeny, Iowa. with 1st- and 2nd-generation Ostrinia nubilalis (Hübner), field com was grown in rows spaced 15, 20, 30, or 40 in. apart, and each spacing was provided with populations of 13,068, 17,242, or 26,136 plants per acre. Granular chemicals (diazinon in 1966 and DDT in 1967 and 1968) were applied with ground machinery at a rate of 1.00 1b active ingredient per acre for control of the corn borer.

Neither the establishment nor the control of 1st- or 2nd-generation borers was significantly affected by row spacing or plant population. However, control tended to decrease as rows were grown closer together. Also, the amount of DDT in the leaves and whorls of samples from plants used to test 1st-generation borers did decrease significantly when the rows were closer together, and the same trend was evident in leaves from plots used to test the 2nd-generation borers. These results suggest as more feet or rows per acre of corn are grown, the higher the rate of insecticides necessary for contral of 1st- and 2nd-generation borers.

Document Type: Research Article

Publication date: December 1, 1971

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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.
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