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Selection for Yellow Clover Aphid and Pea Aphid Resistance in Red Clover¹

Most red clover (Trifolium pratense L.) cultivars are susceptible to attack by the yellow clover aphid (Therioaphis trifolii Monell) and the pea aphid (Acyrthosiphon pisum Harris). Starting with 27 yellow clover aphidresistant plants selected from a wide diversity of germplasm, phenotypic recurrent selection was used to improve resistance to the two aphids. Through five cycles of testing and selection for yellow clover aphid resistance and three such cycles for pea aphid resistance, a synthetic, ‘N-2’, was developed that had a high level of resistance to both aphids.

Key Words: Therioaphis trifolii Monell • Acyrthosiphon pisum Harris • Trifolium pratense L. • Insect resistance • phenotypic recurrent selection

² Supervisory research geneticist and research entomologist, USDA-SEA, AR, and foundation professor of agronomy, Univ. of Nebraska, Lincoln, NE 68583, respectively.

Received for publication August 7, 1978.

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