Tolerance of Alfalfa Clones to the Spotted Alfalfa Aphid1

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Fifteen selected clones of alfalfa, Medicago sativa L., exhibited a wide range of tolerance to Therioaphis maculate (Buckton). Linear regression coefficients, for clonalleaflet damage as a function of aphid infestation duration, varied from 0.000 to 0.757 and 0.000 to 0.557 for excised and intact leaflets, respectively. Mean damage scores after a 7-day infestation were significantly higher for excised than for intact leaflets, but the damage differences varied differentially among clones. Yellowing contrasts between excised and intact leaflets were non significant for 10 but significant for 5 clones.

Damage to alfalfa clones by spotted alfalfa aphid nymphs proceeded more rapidly at 26.5 than at 15.5, but expression of clonal tolerance was similar at the 2 temperatures.

Nymph growth and rate of reproduction of apterous adults varied significantly among clones but was not related to clonal tolerance.

Document Type: Research Article

Publication date: August 1, 1968

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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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