Variety traits

Grape Bloom

Vitis L.

Grape bloom (pruin) is a protective layer of epicuticular wax on the surface of berries, leaves, and shoots, which is an important varietal characteristic and a determinant of fruit shelf life.

In the reference 530 varieties crop Grapevine, where this is mentioned in the description.

In ampelography, the intensity of the bloom is assessed using a visual organoleptic method based on qualitative descriptors such as "weak," "medium," or "heavy." While this trait lacks standardized quantitative units of measurement in industrial practice, it is considered a critical parameter for describing varietal typicality.

Bloom performs protective functions by preventing excessive moisture loss and maintaining berry turgor. It serves as a barrier against the penetration of pathogens, including the causative agents of powdery mildew, and protects tissues from sunburn and photooxidation. The integrity of the bloom directly affects the transportability of grapes, as any damage to it accelerates the development of rot.

The hydrophobic properties of the wax layer must be taken into account when performing agrotechnical operations, as they prevent the uniform distribution of liquids on the plant surface, requiring the addition of surfactants during spraying.

General information about the subject — on the page Waxy bloom.

Sources8

Varieties of Grapevine mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.