There are small thorns on the grapes

People who love fruits must have encountered this situation: the grapes they bought had small thorns on them. People who like to peel grapes before eating them will not have to eat these small thorns. But there are also people who don’t like to peel the skin and will eat it directly into their stomachs. What I want to tell you today is to pay attention to these small thorns, because they may be caused by grape lesions. If you accidentally eat such grapes, people with weak immunity will get sick. So what's the matter with the small thorns on grapes.

This kind of growth on grapes means that the grapes are unhealthy, because there are two possible reasons for this. One is the harm of pathogens, and the other is scale insects (scale insects are an important type of pest on citrus and grapefruit. Common ones include red round scale, brown round scale, Kangpian scale, arrow-pointed scale and blowing cotton scale. Scale insects harm leaves, branches and fruits.

Male scale insects are often winged and can fly, while female insects and larvae, once they emerge from their pupae, live on branches, leaves or fruits for their entire lives, causing yellowing of leaves, withering of branches, decline of tree vigor, and easily inducing sooty disease. ) because this insect has a piercing and sucking mouthparts, and they usually like to suck the juice of grapes. Grapes that have been damaged by scale insects will have moldy spots on the surface and granular protrusions. Because this kind of grapes will not become soft on the surface like other spoiled grapes, many people will eat them by mistake, and eating them directly is harmful to the body.

The main method to prevent scale insects is to increase ventilation and light transmission, and once they occur they should be eliminated in the larval stage. Commonly used pesticides include 1500 times diluted 90% crystalline trichlorfon, 1000 times diluted 50% phoxim, 1500 times diluted 80% DDT emulsifiable concentrate, 1000 times diluted 40% oxydemeton-methyl, 1500 times diluted 50% long-lasting phosphorus, and 800 times diluted 25% phosmet. In winter, you can also spray 10-15 times diluted rosin mixture on deciduous flowers and trees, which has excellent preventive effect. The above-mentioned agents have different killing effects on different types of scale insects. You should read the instructions carefully when purchasing. When one agent is ineffective, you can use another one.