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Is Multiflora rootstock bad?                                      

No.  It's a great rootstock, and depending on your climate and soil type it can be the best.  Unlike  rootstocks such as 'Dr. Huey' or 'Manetti', 'R. multiflora'  is a species rose that will  breed true by seeds.  All non-species rootstocks are propagated from cuttings and other rose viruses (such as the group of viruses lumped under the symptom name rose mosaic) can be transmitted by grafting onto infected rootstocks. Once one cutting is infected, all its offspring will be as well as all the rootstock used with each and every budeye. Those viruses are not transmitted through seeds, so when clean budwood is used on multiflora grown from seed you are guaranteed a clean plant.   

An unintended  result of the association of  'R. multiflora' with RRD by those writing in scientific literature has been the creation of a mistaken belief in some rose growers that plants on multiflora rootstock are more susceptible to the disease.  RRD is a disease of the canes that enters the plants on their canes and stems.   The sole negative of multiflora rootstock may be that it may produce a larger, healthier rose which becomes a slightly larger target for the vector mites.
        
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