Scale insects weaken tree vigor to withered branches How to control scale insects of kiwifruit

The main scale insects harming kiwifruit are paramecium, persimmon powder scale, mulberry white scale and so on. Scale insects are protected by hard shell or white powder, so it is difficult to control them, so it is necessary to grasp its weak links to get twice the result with half the effort.

Control of scale insects in kiwifruit

1. Harmful characteristics: scale insects have several generations in a year. Female adults and nymphs are used as damage to trees, which are attached to tree trunks, branches and leaves, and suck the sap of branches and leaves. The scale can also harm the fruit of kiwifruit. Its mobility is poor, more concentrated distribution, easy to completely eliminate. The eggs, larvae and female adults of scale insects overwinter in the trunk, vine and soil of the branches. For example, in May, the female paramecium overwintered in the 5~7cm deep soil crevice or under the stone around the trunk, secreted white woolly oocysts and laid eggs in it, overwintering over the summer, while the mulberry white scale overwintered as fertilized females on the branches and vines, while the second instar nymphs and a few adults overwintered on the withered branches and leaves. Because of the waxy shell of female adults and nymphs, the liquid is difficult to penetrate, the effect of contact insecticides is poor, and the internal inhalation pesticides are better. When the damage is serious, an uneven clam shell is formed on the surface of the branches, which weakens the tree potential and leads to the death of the branches or the whole tree.

Second, prevention and control methods:

1, strengthen quarantine, in Europe, North America, export fruit, the narrow mouth shield scale as the quarantine object. Shell insects are used as the object of transportation and quarantine of seedlings and fruits in our country.

2. Brush off the worms on the branches of rhesus monkeys with hard plastic brushes or fine wire brushes in winter. And when pruning, cut off the bugs and gather the branches. Before sprouting, scrape off the old skin at the base of the trunk and apply sticky glue with a width of about 10cm.

3. In the larval creeping period after hatching, 1000 times of Lesbon can be sprayed. It should be noted that the hatching period of scale insects varies, and it is best to spray again every 5-7 days to achieve the control effect.

4. Before the kiwifruit tree sprouts, spraying paracetamol or environment-friendly light EC forms an air barrier on the surface of the insect, causing it to suffocate to death.