Yellow flecks appear on the edges of the leaf or leaf exhibits yellow variegation or mosaic.
Plant is a black currant. Oregon Black currant yellows on 'Kantata 50' cultivated in Corvallis, Oregon. The cause of this condition is not known and may be a physiological disorder. Thus far, unlike viral diseases, this condition has not been demonstrated to be transmitted to other plants. The cause of this condition could be a genetic disorder.