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Non-Preference as a Mechanism of Sweetclover and Alfalfa Resistance to the Sweetclover Aphid and the Spotted Alfalfa Aphid

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Aphids, Therioaphis maculata (Buck ton) and T. riehmi (Börner), had high mortality rates when confined to various resistant host plants and nonhost plants but these rates were seldom higher than a starvation treatment. When given a free choice among resistant host, nonhost, and susceptible hosts, no preference was manifested initially but migration from the resistant and nonhost plants onto the susceptible plants commenced within a few hours. After 12-hours it was evident that aphids preferred the susceptible plants the most, the resistant plants next, and the nonhost plants the least. Migration of the aphids occurred without appreciable mortality. Tests in which aphids were transferred from resistant to susceptible plants produced no evidence of carryover effects of a toxic substance in the resistant plants. Thus it was concluded that nonpreference is the primary mechanism for resistance to both species of aphids in the alfalfa and sweetclover selections that were studied.

Document Type: Research Article

Publication date: April 1, 1965

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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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