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Strawberry ( Fragaria ×ananassa  Duch.) seedlings from a factorial mating design were tested in each of two locations using two propagule types (seedlings and runners). Genotypic correlations were used to indicate G × E interaction across these locations and propagation systems and to predict correlated responses between selection under specific conditions and commercial propagation. A combined index on relatives was constructed and used to select four groups of individuals—one for each location-propagule combination—for each of two production traits. Comparison was then made with realized responses from subsequent clonal testing at a single site representing the commercial environment. Although selection in the commercial environment (Watsonville) was predicted to give the greatest selection response, realized responses were greatest for the Wolfskill site. Additionally, the present system of selecting seedlings at Wolfskill and testing clones at Watsonville offers considerable logistical advantages that may outweight genetic considerations. The concept of effective index heritability was introduced to enable the calculation of predicted response based on index selection. Neither the use of clonally tested parents nor a comparative seedling set selected for another trait was ideal for estimating realized response.

Predicted and Realized Response of Strawberry Production Traits to Selection in Differing Environments and Propagation Systems