Abstract
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.
Published Version
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