Events Post Capfall

The European grape varieties that we have planted in our vineyard have perfect flowers, which means that they contain both the male and female reproductive organs and are therefore self-pollinating. They do not require bees to be pollinated.
Events that occur immediately post capfall include the following:¹

Grape Flower Parts

Pollination/Fertilization

Immediately after capfall, the anthers split open and release their pollen grains The pollen grains adhere to substances secreted on the stigma Pollination is complete once the pollen has reached the stigma The pollen grains germinate and form pollen tubes The male gametes (sperm) travel through the pollen tube to the ovary Fertilization occurs when sperm reaches and impregnates the eggs within the embryo sacs Under normal field conditions, fertilization typically occurs two to three days after pollination

References:
1. NiCk K. DokoozLian, Grape Berry Growth and Development.