Stability of Green Peach Aphid Resistance in Tuber-bearing Solanum Introductions and Its Effect on Screening Procedures 1

1 December 1974

journal article
Published by Oxford University Press (OUP) in Environmental Entomology

Vol. 3 (6) , 1022-1026
https://doi.org/10.1093/ee/3.6.1022

Abstract

Resistance to green peach aphid (OPA), Myzus persicae (Sulzer), appears to be a relatively stable characteristic in tuber-bearing Solanum species. A high heritability estimate was obtained in replicated field trials over environments and counting dates. Consideration of variance components indicated that multiple evaluations in at least 2 environments with 2 counting dates per environment are desirable for final evaluations of resistance. The number of replications per environment can be reduced to 2 without markedly affecting the heritability estimate or the expected gain in resistance through selection. Results suggest that preliminary screening can be satisfactorily accomplished with one environment and one counting date.

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