First of all, fruit flies
Drosophila belongs to small flies, with a body length of 1.5-4 mm, most of which are yellowish brown and some are black. There are a pair of bright red compound eyes on the head, three pairs of cilia on the inside of the two compound eyes, and the center of the back between the compound eyes is slightly raised to form a monocular triangle. There are a pair of monocular bristles in the front and bottom of each of the three monocular eyes, which is very fertile. When the conditions are right, one is very fertile
Drosophila is widely distributed in temperate and tropical climate zones all over the world. Its staple food is yeast, and rotten fruit is easy to breed yeast. Only a few of them feed on fungi and sap or pollen, so they can be seen in orchards and vegetable markets.
Second, the harm of fruit flies
Adults of Drosophila melanogaster tend to be sweet and yellow. Adults lay eggs under the skin of the fruit, and larvae do harm in the fruit after hatching. When the larvae mature, they drill out and fall into the topsoil to pupate. After pupae emerge into adults, mating and spawning are harmful to pears, persimmons, cherries, pomegranates, peaches and other fruits, and also harmful to melons and vegetables.
The melons and fruits laid in the eggs have no obvious symptoms in a short time. However, as the eggs hatch into larvae, the symptoms are serious, and the damaged fruit surface will appear a little wet rot-like depression, which is slightly darker and dull than the normal fruit surface. After that, the damaged fruit will rot first, losing its edible value and economic value, which will affect the quality and market sales.
Third, how to catch fruit flies
1, with rotten fruit
You may find that the neglected fruit will only attract fruit flies after rotting. Gather fruit flies in this way first, and then catch them, but this time the consequences will be even more terrible. Put old or rotten fruit in a bowl and cover the top of the bowl with transparent plastic. Poke a small hole in the plastic with a toothpick and put the bowl near the place where the fruit flies gather. Drosophila will be attracted by the aroma of fruit and will never come out after entering.
Step 2 use apple vinegar
Pour a little apple vinegar into the cup and put a plastic or paper funnel on the cup. The funnel blocked most of the entrance of the cup, leaving only a small passage for fruit flies to enter, but they were not smart enough to go out. You can also add a little dishwashing agent to vinegar to poison fruit flies.