Selection and Evaluation of Pea Aphid-Resistant Alfalfa Plants1

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Abstract:

Various selection criteria were effective in isolating pea aphid, Macrosiphum pisi (Harr.), resistant plants from susceptible alfalfa, Medicago satire L., populations and these selection criteria also appeared suitable for the evaluation of progeny from resistant plant selections. Selection of vigorous surviving seedlings after infestation with large aphid populations in early seedling stage was a practical and rapid method for use in the selection of resistant plants. Selection and evaluation for resistance were also accomplished on the basis of differential plant stunting at various growth stages and on basis of aphid colonization on individual plants. Although some of the techniques presented were applicable to field conditions under natural aphid infestation, the advantage of greenhouse screening and evaluation in the seedling stage is evident. The general agreement of the results obtained with the various techniques employed indicates their validity and usefulness as a basis for selecting and evaluating resistant plants.

Document Type: Research Article

Publication date: October 1, 1960

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