Abstract
Abstract In a study of breeding of strawberry (Fragaria × ananassa Duch.) for resistance to red stele root rot caused by Phytophthora fragariae Hickman, two different composites of races of the fungus were used to screen seedlings, one with and one without race A-5. In the absence of race A-5, all resistant parents produced between 28.6 to 72.0% resistant seedlings depending upon parental combinations. When race A-5 was included in the composite, two breeding selections that were derived from Fragaria chiloensis Yaquina A clone transmitted more resistance to their seedlings than three other parents in a diallel comparison. Mean squares and variance components were higher for general than for specific combining ability. Resistance is partially dominant for the races involved in this study.
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