and M.27 (Table 2). 



The most efficient rootstocks were SJP84-5198 in 

 Dunham (Table 3) and SJP84-5218 in Mont St- 

 Gregoire (Table 2). MM. Ill resulted in the lowest 

 efficiency at both sites. Few differences existed in 

 burrknot rating (Tables 2 and 3) or root suckering 

 (Table 2). 



Based on the observation made since 1984 in six 

 orchards, nine of the SJP84 series are being released 

 for commercial testing and evaluation. All the retained 

 SJP84 senes are winter hardy, easier to propagate in 

 stool bed than 0.3, and produce a thick and vertical 

 growing sucker in stool bed. No mildew, scab, or 

 woolly aphid was observed on these rootstocks. To date, 

 no graft incompatibility has been observed. 



SJP84-5218 and SJP84-5198 stand out from the 

 superior group, based on the visual tree observation 

 (height, spread, branch angle, fruit distribution, tree 

 form, graft union, root suckers, and burr knots) in five 

 locations and also on their performance in stool beds. 



A patent is pending for all of the SJP84 series 

 rootstocks. A limited number of rootstocks are available 

 for research purposes from the author (SK). Non- 

 exclusive multiplication licences can be obtained from 

 Agriculture and Agri-Food Canada. European nurseries 

 can obtain a multiplication licence from Meiosis Ltd. 

 (Bradboume House, Siable Block, East Mailing, Kent 

 ME19 6DZ). 



Literature Cited 



Anon. 1976. Pommier-culture. Agdex 211/20. 

 Publication 333. Conseils des productions 

 vegetales du Quebec (production Guide). 



Asnong, J. 1982. L'industrie de la pomme au Quebec: 

 Etat de la situation. Conference socioeconomique 

 sur l'industrie de la pomme. Min. Agr. Pecheres et 

 alimentation du Quebec. 



Brown, G.N. 1978. Protein synthesis mechanisms 

 relative to cold hardiness, in Plant cold hardiness 



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