Are scale insects harmful to people?

Scale insects are a kind of important pests on citrus and grapefruit. The common pests are red round scale, brown round scale, Kangpian scale, sagittal scale, blow cotton scale and so on. Some species are important pests, harming leaves, branches and fruits, causing leaves yellowing, branch withering, tree potential decline and easy to cause soot disease. Let's take a look at whether the scale insects are harmful to people.

Are scale insects harmful to people?

Scale insects do little harm to human beings. Scale insects are mainly harmful to plants. After spawning, female adults can hatch mobile insects without waxy shells in a few days. After the larvae crawl on the ornamental plants and find a suitable place, they stab the mouthparts into the flowers and trees, absorb the juice, and begin to live a fixed life, making the host plants lose nutrition and lose a lot of water. After the young buds and twigs are damaged, poor growth often leads to yellowing and wilting. While endangering ornamental plants, some also discharge a large number of honeydew, resulting in the occurrence of bituminous coal disease, so that the leaves can not carry out photosynthesis, seriously damaged plants, tree potential decline, and finally the whole plant withered.

Host plants of shell insects

Scale insects are widely distributed, especially in tropical and subtropical regions, and their relationship with host plants is complicated. Most of them are polyphagous and can feed on a variety of plant groups, such as more than 100 host plants, among which the most hobbies are Australian acacia, citrus and Casuarina equisetifolia. Some scale insects are monophagous, and even some families or genera are specialized and can only be parasitized on a fixed plant group, such as the species of the genus Coccidae parasitized exclusively on bamboo, pine oyster scale parasitized on pine trees, and so on.

Control techniques of shell insects

1. Plant quarantine: shell insects are often fixed and parasitic, and their bodies are small and spread over a long distance mainly carried by host branches, scions, fruits and even tree trunks. Quarantine should be carried out on seedlings, scions and fruit procurement, transportation and protected areas to prevent spread.

2. Agricultural prevention and control: strengthening orchard management, timely ploughing and loosening soil, fertilization and irrigation to meet the needs of fruit trees for water and fertilizer, can enhance the tree potential and improve the insect resistance of fruit trees. Combined with shaping and pruning, the insect-carrying branches are centrally burned, which can greatly reduce the number of insect population.

3. Biological control: the natural enemies of scale insects in nature include pathogenic microorganisms and insects, of which the latter is the most important. Moreover, all localities have some successful experiences in protecting and using natural enemies to control the harm of scale insects, which should be summarized and popularized.

4. Physical control: grasping the two weak links in the life activities of scale insects and using physical and mechanical methods can get twice the result with half the effort. For the grass scale, the method of digging a hole near the root of the tree can also be used to destroy it under the tree.

5. Chemical control: three kinds of agents, methamphetamidophos, thiazide and organosilicon penetrating agents, are used to kill the eggs in the soil by spraying leaves and spraying wet soil surface or irrigating roots. The proportion of the medicine is 1500 times that of 1 Grout. Take 1 gram of each medicament, taking a total of 3 grams.