In this experiment,we determined winter critical killing temperatures for 19 grape varieties and species (including 16 rootstocks ) . There is great difference in cold hardiness among the varieties tested. This may provide suggestive basis for choosing cold resistant rootstocks.
We also compared several methods for testing cold hardiness and found that the combination of electrolytic conductance method with the method of root section culture was more simple and reliable. By observing the tissue str...