Recently, some consumers have asked if there are grapes on the market that are full of "thorns". What is the reason? Can you rest assured? To this end, Xinhuanet interviewed Wang Zhongyue, director of the National Grape Industry Technology System Pest and Disease Research Office, Wu Jiang, the director of the National Comprehensive Testing Station of the National Grape Industry Technology System, and Wang Qiang, an expert in quality and safety evaluation of the national grape industry technology system. All three experts said that the long thorn on the grape skin can be caused by a variety of reasons.
First, the scale insects damage the grape fruit, pierce the pericarp into the peel and absorb the grape juice, so that the surface of the grape forms a small bump;
Second, the growth rate of grape fruit is too fast, especially due to climate, environmental impact or excessive application of trace elements, resulting in the proliferation and enlargement of dermal cells, forming small bumps;
Third, improper use of plant growth regulators, such as inappropriate application period, inappropriate dosage, inappropriate climate, etc., can also cause grape skin cells to expand or proliferate, forming a convex shape;
Fourth, some varieties are sensitive to certain agents. After use, the stomata cells of the peel are aged or enlarged, and the shape is like a bump.
In addition, the jumbo cultivar is in maturity. If the meteorological conditions are special, some fungi that feed on the fruit powder will cause the white fungus to grow and form white colonies. Some white varieties will easily form browning in the skin. A bad person looks like a brown bump, and so on. The "long thorn" grape is not terrible, don't worry too much. The bulges caused by pests, germs or pests are infested or adsorbed on the surface of the peel. As long as it is washed or stripped clean, the grapes are still edible. Because these germs or pests only harm the grapes, they are not necessarily harmful to consumers. If it is caused by too fast growth, this is a physiological phenomenon of the grape itself, and has no effect on the consumer. If the thorns on the grapes cannot be removed or peeled off, it is more likely to belong to this physiological phenomenon. According to the survey of more than 10 years of field experience and industrial problems of the plant protection expert team of the national grape industry technical system, the "long thorn" on the grape skin mainly appears in the giant peak variety and the Kreisen seedless grape. Some green varieties also have browning of lenticels, but there is no case where lentic cells proliferate and become large and form bulges.