Cultivation
Grape pollinator cultivar
Vitis L.
A pollinator cultivar is a variety with a perfect flower type, necessary for the fertilization of grapes with a functionally female flower type, the pollen of which is sterile.
In the reference 33 varieties crop Grapevine, where this is mentioned in the description.
In grapes, the presence of a functionally female flower type with short stamens makes a cultivar dependent on cross-pollination. Without pollen from another cultivar reaching the stigma of the pistil, the crop does not set, or small, underdeveloped berries prone to millerandage are formed.
When selecting a pollinator cultivar, it is critical that the flowering periods coincide with the cultivar being pollinated. The pollinator must be perfect-flowered, and its placement in the vineyard must account for the predominantly wind-borne method of pollen transfer, ensuring free airflow between the vines.
Even for perfect-flowered grape cultivars, cross-pollination is beneficial, increasing yields by 20–50% by reducing ovary shedding. In unfavorable weather during flowering, agronomists apply manual supplemental pollination using a mixture of pollen from various perfect-flowered cultivars.
General information about the subject — on the page Pollinizer variety.
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.
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