Danni da gelo invernale sul kiwi: valutazioni nel Cuneese dopo il 2009.

[Autom. eng. transl.] The severe frost that occurred in the Cuneo area on December 20, 2009, provided an opportunity to investigate the damage caused to the actinidieti due to some variables. Specific analytical investigations were then carried out in 4 actinidietas, in each of which were considered young plants and adult plants of the Hayward cultivar, with 5 pairs of female plants. After 2 months from the frost, the buds carried by spur branches, 1-year-old mixed branches, branches that had already fructified the previous year and suckers were dissected of each plant to determine the mortality of the buds. During the following vegetative season the percentage of sprouted nodes were recorded, how many of them were fertile, the number of fruits they bore, as well as the production per hectare of each actinidieto. The results showed that the frost caused a mortality of the gems in relation to the entity of the minimum temperatures, while the budding of those "spared" by the frost did not appear clearly related. The young actinidietas have been shown to be more sensitive to freezing than the adult ones and the buds of the suckers have been found to be much more sensitive than those carried by the mixed spur branches. The production decline was particularly evident for the actinidieto of Verzuolo, where an absolute minimum of -19 ° C was reached.