Scale insects have strong reproductive ability and occur for many generations a year. And the drug resistance is strong, and it is difficult for drugs to enter the body, so it is difficult to prevent and control. So, once it happens, it's hard to clean up.

Scale insects are important pests on citrus and grapefruit, and there are scale insects, scale insects, scale insects and so on. Scale insects harm leaves, branches and fruits.

Scale insects are often male, have wings and can fly. Once female insects and larvae emerge, they feed on branches and leaves or fruits all their lives, resulting in yellowing of leaves, withering of branches and leaves, and decline of tree potential, which is easy to induce soot disease.

Artificial transmission is the main mode of transmission of scale insects. Various agricultural operations will lead to the spread of scale insects between plants and farmland. With the development of modern transportation and economic globalization, various goods, agricultural products and seedlings are frequently transported, which provides favorable conditions for the long-distance spread of scale insects. For example, the origin of scale insects is Australia, and then gradually spread to all countries in the world with human activities.

Therefore, strengthening plant quarantine is the fundamental measure to prevent the spread of scale insects.

Extended data:

There are two reproductive modes of scale insects: hermaphroditism and parthenogenesis. Most species are hermaphroditic, that is, they reproduce offspring by mating male and female adults, such as scale insects, and females cannot lay eggs without mating with males. Some scale insects, such as Ceratoides koreana, have to mate several times before they can reproduce;

There are still many species that have not found males and parthenogenesis, such as some Heno 1 ecanium cornibouche. Only when parasitism harms plum trees can a few males differentiate. Icerya purchasi Maskell is bisexual and parthenogenetic.

Baidu encyclopedia-scale insects