Which vine training system is most commonly used throughout Italy?

The two wire vertical shoot positioning (VSP) system is widely used in Italy due to its effectiveness in managing vine growth and optimizing grape quality. This system allows for good exposure of the grape clusters to sunlight and facilitates air circulation around the canopy. These factors are essential in Italy's diverse climates, as they help reduce the risk of disease and promote even ripening.

The VSP system supports the vines in an upright position, which is particularly beneficial in regions that experience high humidity or rainfall. By training the shoots vertically, this system can effectively channel nutrients and water to the grapes, enhancing their development. Additionally, it simplifies vineyard management tasks such as pruning, harvesting, and canopy maintenance.

In contrast, other training systems like flat pergola and Château style may be found in specific locales or styles but do not match the widespread utility and adaptability of VSP across Italy's wine regions. Single Guyot, while effective in certain contexts, is less customizable for the varied vineyard conditions present throughout the country.