Why are there a layer of white frost on grapes and other fruits? Is it really pesticide residue?

When we go to the supermarket to buy fruit, we often see a layer of white frost on the surface of the fruit, the most common are grapes, raisins, plums, persimmons, blueberries and so on. Why is that? Is it really what netizens say about pesticide residues?

Grape

Some netizens are interested in this "white film" on the outer layer of berries. For example, this white powder can often be seen on the surface of grapes. Some netizens think that this is an uncleaned pesticide or harmful substance, but it is not. This "white film" can be seen on the outer layer of many berries, and their true identities are fruit fans.

Blueberry

Fruit powder is formed naturally, for example, grapes, blueberries, cranberries, etc., the more fruit powder in the outer layer, the better their quality. This layer of fruit powder is not easy to wash off, do not need to wash off, for the human body, fruit powder is rich in nutrients polyphenols, but also can inhibit the production of oral bacteria, is a very good thing.

Plum

When eating fruit, you don't have to wash off this white film, in fact, they are good. If you are really worried about pesticide residues, you should pay attention to the fact that it is best not to buy off-season fruits and vegetables, because the pesticide residues in the greenhouse are indeed slightly higher than emergency vegetables and fruits, and you can soak them in light salt water for a longer period of time. It will be better for pesticides to go. Fruits that can be peeled can also be peeled, although the skins are rich in dietary fiber, vitamins and flavonoids. But these substances are also abundant in the pulp. Generally qualified fruit pesticide residue testing will meet the standard, so there is no need to worry too much about the problem of agricultural residues.

Persimmon