How to control pear aphid caused by APHIS gossypii

Pear yellow pink aphid is mainly concentrated in the sunken part of pear calyx, which can also harm other parts of pear; it is the most harmful to bagged green pear, which is macular at first, sinks slightly, then becomes black spot, and expands; the calyx depression of pear will be damaged by large spots, which makes the pear lose its commercial value completely, and when yellow pink aphid is rampant, it can cause no harvest. The damage caused by Tenebrio Molitor is characterized by the accumulation of fresh yellow powder on the damaged part of the pear.

APHIS gossypii

There are 6-9 generations a year, overwintering with eggs in the stitches of tree bark, fruit platform and so on. It transferred to the pear in the first and middle of June, and reached the damage peak in the near maturity period in the middle and late August, and the pile-like yellow powder could be seen on the surface of the pear. From August to September, the existing sexual aphids transferred to the fruit platform, bark seams and other places to lay eggs and survive the winter. After improper bagging of pears or yellow powder aphids, the damage caused by pear bagging is more serious because it is not easy to control and propagate faster.

Prevention and control methods:

1. Agricultural control: combined with other diseases and insect pests, scrape off all kinds of old warped skin from pear trees in winter; combined with winter shears, eliminate all kinds of residues attached to pear trees and burn them centrally, so as to eliminate overwintering eggs.

two。 Biological control: protection and utilization of natural enemies of yellow powder aphid. The common predatory insects in northern pear orchards are ladybugs, lacewings and so on. As long as certain measures are taken to protect natural enemies, the number of yellow powder aphids can be better controlled.

3. Chemical control: early spring application should focus on the base of the trunk and main branches of the pear tree; during the growing season, attention should be paid to evenly spraying the pear, especially the calyx depression (more attention should be paid to the pear varieties with persistent sepals).

Main medicament: spray 5 Baumedu stone sulfur mixture before pear germination; other periods can be used imidacloprid, imidacloprid, cypermethrin, fenvalerate and so on.