Genetic control of crossing was accomplished by using inbreds with homozygous S‐alleles to produce double‐cross hybrid red clover ( Trifolium pratense L.). The method, checked by the use of the leafmark gene, proved to be effective in controlling crosses for the production of hybrids. Single and double crosses were evaluated for performance. Certain I 1 single and double crosses showed consistently good performance in all characters studied, but most were not superior to the best check variety. Significant correlations were observed between characters evaluated in spaced plantings and broadcast plots, indicating that spaced plantings can be used effectively in the preliminary selection of superior single and double crosses.
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