Is the "hoarfrost" on the fruit peel a pesticide residue?

Now it is the season when a large number of grapes are on the market, but many citizens find that they often see a layer of "hoarfrost" on the surface of the grapes when buying, and it is very laborious to clean them
.
Some people worry that this is a pesticide residue, while others think it is a sign of fruit freshness
.
"When I buy grapes, I usually choose this kind of frost.
It feels fresh when I look at it.
But when I get home, I always try my best to wash off this frost.
Who knows how this thing is good for people? Does it affect the body? We are also afraid of pesticides
.
” said Zhou Ling, a citizen who lives near Youyi Road in Hexi District
.
In fact, during the interview, the reporter found that not only grapes, but also many fruits can be found on the surface of this kind of "hoarfrost"
.
"This'frost' is okay, you see, the fruits I sell such as plums, prunes, and blueberries have'frost' on the surface.
The'frost' indicates that the fruits are fresh
.
" Lao Zhao, the stall owner who sells fruits at the Meijiang Vegetable Market, told Reporter
.
So what exactly is this "hoarfrost"? If once consumed, is it harmful to human health? The reporter interviewed Huang Jianquan, head of the Grape Research Center of Tianjin Academy of Agricultural Sciences on this issue
.
He said that the scientific name of this "cream" is "fruit powder", which is a sugar alcohol substance secreted by the fruits and vegetables themselves, which is harmless to the human body
.
"This layer of fruit powder has a protective effect on the fruit.
For example, this layer of fruit powder on the surface of grapes can reduce water evaporation, so the presence of'frost' is indeed a sign of fruit freshness, and it means that there is less pesticide
.
" Huang Jianquan said
.
　　However, he also said that it is indeed difficult for ordinary people to find out whether there are pesticide residues on the surface of the grapes.
Therefore, it is recommended that the public should pay attention to soaking when cleaning the grapes
.
When soaking, a small amount of salt can be added appropriately to achieve the sterilization effect
.

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Reporter: Zhang Wenjing