Orchard trial performance of elite Geneva series rootstocks.

摘要

The Geneva New York based Apple Rootstock Breeding and Evaluation Programme has released five new rootstock genotypes in recent years, and eleven additional genotypes are under consideration for possible release. Orchard performance of these rootstocks has been evaluated through numerous trials in New York, and through recently initiated trials in Michigan and Washington State (USA). Some of these elite genotypes have also been evaluated at sites across North America as a part of the NC-140 regional project. The genotypes Novole, G.65, G.16, G.11, and G.30 have been patented and released for commercial production. Geneva 16 and G.11 are fire blight tolerant competitors for M.9 and M.26, respectively. The earlier expectations of G.65 and G.30, possible competitors for M.27 and M.7, respectively, have been muted by horticultural problems in the nursery and by poor anchorage. Ten additional Cornell-Geneva series genotypes are presently under evaluation in commercial nursery stoolbeds, and these represent the next possible releases from the programme. CG.4202 and CG.6210 (formerly known as CG.202 and CG.210) merit particular attention for Southern Hemisphere growers because they appear to have resistance to the woolly apple aphid (Eriosoma lanigerans).