Cherry Drosophila, the larva of this insect, is a kind of fruit fly, not only on cherries, but also on berry plants such as strawberries and bayberry. Professor Li said, "The adults of the cherry fruit fly will lay eggs under the peel of the cherry, which is about 10 times a year. Eggs hatch in cherries, and when they become larvae, they feed on pulp, so the white worms we see now are fruit fly larvae hatched inside cherries. "

"It is very common that there are eggs in cherries. Even after being soaked in water, there are probably eggs in cherries without fruit fly larvae. Fresh fruit does not meet the hatching conditions of eggs. Once it is picked and stored for a period of time, the temperature of the fruit rises, and when it encounters water, the larvae will drill out. " Professor Li told the reporter, "In fact, cherry fruit flies, whether eggs or larvae, are harmless to the human body. It's just that it looks very much like a maggot, and it will inevitably make people sick after seeing it. "

It is best to buy berries that have just been picked, because the time from picking is short and the chance of larvae is small. Once preserved for a few days, the eggs will hatch due to the rising temperature.

It is understood that with the extension of planting years and the increase of planting area of big cherry, the rate of fruit infection with Drosophila has also increased, so this situation is much more than in previous years. From the time the fruit flies lay eggs in the fruit to hatch larvae, and then to the early stage of larval development, it is difficult to tell whether the fruit is parasitized or not from the appearance of the fruit, until the larvae mature and the parasitized fruit sinks and softens, and then the symptoms of parasitism appear.

"In theory, there are two ways to prevent fruit flies, one is bagging, and the other is relying on drugs. Because the cherry fruit is small and large, bagging is definitely not feasible, so it can only be prevented by drugs. " Professor Li said, "First of all, we can take measures to trap and kill adults. We can mix ammonia (ammonium carbonate, ammonium acetate), hydrolyzed yeast or hydrolyzed protein with sugar, and add some sticky substances or pesticides to make attractants. In the orchard, 5- 10 traps can be hung for trapping and killing. Secondly, the number of larvae can be reduced. During the fruit ripening period, rotten fruits or fallen fruits in the field are collected and concentrated for soaking every day to reduce the source of insects. Avoid planting host crops such as tomatoes and peppers in and around the orchard, which plays an important role in cutting off the food chain of the insect. "