AbstractP. spp. grown on various media containing an aq. extract of coloured French bean (Phaseolus vulgaris cv. Canadian Wonder) seeds produced an orange colour which was associated closely with oospore formation. No colour was produced in cultures without oospores or on the media without the extract or containing an extract of a white-seeded bean. It is concluded that colour production with oospores is probably associated with the anthocyanin content of the seed coats.