Symptoms: This is a disease caused by the virus. After the disease, there are yellow green and dark green patterns on the leaves. The whole leaves will become smaller and the whole plant will shrink.
Prevention and treatment: pull out the diseased plant in time after finding the diseased plant, and then gather it to burn it. It is also necessary to spray insecticides in time to prevent virus infection.
Symptoms: at the beginning of the disease, the young leaves and buds will be affected. White powder will appear on both sides of the leaves, and then the leaves will turn yellow. The damaged plants will be smaller and less lush, and the leaves will be uneven.
Prevention and control: pay attention to cultivation and management at ordinary times, promote the growth of plants to be robust, and improve the ability of disease resistance. It can also be used in combination with spraying, rust Ning or tolbutine methyl.
Symptoms: the larva will dive into the new shoots and tender leaves of the plant, causing the whole leaf not to stretch, and it is easy to fall off, which will lead to all withering and yellowness in serious cases.
Control: it is the most suitable period for control in adult emergence stage and young larva stage. It can spray 2000-3000 times of 10% permethrin, once every 7-10 days, 3-4 times continuously.
