Attached vs. Excised Trifoliolates for Evaluation of Resistance In Alfalfa to the Spotted Alfalfa Aphid1

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Spotted alfalfa aphid, Therioaphis maculata (Buckton),adult and nymphal survival was used to compare the level of resistance between caged trifoliolates on the plant and the corresponding plant part which had been detached. The adult and nymphal survival averaged over clones and replications was higher on excised than intact alfalfa trifoliolates. However, the differences in survival varied differentially among the clones tested. Adult and nymphal survival differences between intact and excised plant parts were significant on 24% (adult survival) and 20% (nymphal survival) of the clones.

In all cases where the differences were significant, the survival on the excised trifoliolates exceeded that on the intact trifoliolates of the same clone. No significant differences in adult or nymphal survival were detected where the terminal was removed or left intact on the excised plant parts.

From a practical standpoint, the results indicated that using the excised-trifoliolate procedure in resistance screening tended to underestimate the resistance level of the plant population tested.

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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