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Effects of a Nitrogen-Deficient Host and Crowding on the Corn Leaf Aphid1

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Corn leaf aphids, Rhopalosiphum maidis (Fitch), were allowed to feed on sorghum plants grown under high and low levels of nitrogen. Results showed that more than. twice as many aphids were found on plants receiving nitrogen than on nitrogen-deficient plants. Other tests indicated that the reduction in aphid fecundity was due to a crowding response rather than to nitrogen deficiency. Aphid densities (number of aphids per gram of green plant weight) were more than double on nitrogen-deficient plants than on plants receiving nitrogen.

The percentage of alate aphids on nitrogen-deficient plants was twice that on plants that were not deficient. The higher percentage of alate aphids appeared to be due to nitrogen deficiency and not to overcrowding.

Document Type: Research Article

Publication date: April 1, 1966

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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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