Abstract
A procedure is described to test the resistance of seedlings of Gerbera jamesonii to Phytophthora cryptogea. The inheritance of resistance was investigated by means of a programme of diallel crosses. General combining ability (gca) was found to be the major component of total progeny variance, indicating that the larger part of genetic variation is likely to be attributable to additive gene-action. The various possibilities of testing relative breeding values of parent clones are compared: selfings, test crosses with a standard clone or clonal tests. For practical reasons preference is given to test crosses in which a self-incompatible but highly cross-fertile standard clone is used as the female partner.
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