Abstract
Abstract Although roses have been propagated by grafting for more than a century, there has been relatively no concerted breeding effort to develop rootstocks (understocks) as has been done for rosaceous fruit crops. Selection of cultivars, both asexually and sexually propagated, that have been used for propagating roses has come about so far more by fortuitious circumstance than by design. A survey (1) of rootstocks used in rose propagation indicated that the largest number were derivatives of either the Caninae or the Synstylae tribes, with the Caninae being more prevalent in Europe and the Synstylae in the U.S. Also, the survey delineated those qualities desired as well as those in which the commonly-used rose root-stocks were deficient. Characteristics found lacking were root flexibility, a trait of importance to to all nurserymen packaging rose plants either for sale or shipment, tolerance to low soil temp, and resistance or tolerance to soil-borne pests such as nematodes.
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