Summer black grape is a natural seedless grape, with small fruit grains, with an average grain weight of 3-3.5g. In order to increase the fruit grains, gibberellin treatment is generally required, and the stems are hard and thick after treatment, but there will be small granular bumps on the grape fruit surface.
Gibberellin treatment period is in full bloom, which is forty or fifty days away from the grape picking period, so eating it will not be harmful to human body.
Extended data
The growth characteristics of summer black grape are similar to those of Kyoho but better than Kyoho. High sugar content, better storage and transportation resistance than common varieties, and less prone to bursting due to extrusion during transportation. From germination to fruit ripening 100~ 105 days. After the fruit begins to soften, spraying 1 time for grape ripening, sugar increase and color development can be put on the market 7~ 10 days in advance, which can greatly improve the commodity value.
Under general management, the sugar content of Xiahei grape can reach 20~22 degrees, and the highest can reach 24 degrees. It is the sweetest early-maturing grape in China, so it is also called "super sweet grape".
The skin of summer black grape is thick, and it is not easy to break due to extrusion during transportation; High sugar content, more resistant to storage and transportation than ordinary varieties.
Baidu Encyclopedia-Summer Black Grape