1. Brown spot

Brown spots appear on the green leaves of tung trees. These spots are round, oval and irregular in shape, some large and some small; The color is dark brown and light brown; Some leaves have a spot, and some leaves have several spots of different sizes, which is brown spot. In the later stage, brown spot will produce small black spots in the center of the spot, which is the pathogen

Prevention and control methods

First of all, stop and isolate pathogens from the source. Buyers should pay attention to checking leaves when buying, and do not buy seedlings with spots; The Seller shall inspect his seedlings at any time and treat or destroy them in time if any disease is found. After purchase, plant them scientifically and take care of them carefully to enhance their immunity. If spotted branches and leaves are found, they shall be removed and destroyed in time. If it is determined that they have the disease, they can also be treated by spraying pesticides according to the correct treatment method

2. Bituminous coal disease

Bituminous coal disease is mainly manifested in the leaves. It is some moldy things like coal ash, which will cover the leaves, so that the leaves can not receive light, so that they can not grow normally, and finally can only dry and die

Prevention and control methods

Because soot mainly affects the light of plants, to prevent and control this disease, we should make the branches and leaves reasonable, sparse and orderly, so that each leaf can bathe in the sun; If any diseased branch is found, it shall be cut off and destroyed in time

3. Puff scale

Cotton scale is a kind of pest that looks like a spider. It seriously affects the healthy growth of tung trees. It even occurs many times a year. It is a very stubborn pest that is difficult to control

Prevention and control methods

Like the prevention and control of brown spot disease, first block it from the source. Buyers pay attention to inspection when buying, find pests and refuse to buy; The seller takes good care of his seedlings, finds pests and treats them in time. When pests are found after planting, the branches and leaves with pests should be cut off and taken out of the field for destruction. Insect control can also be carried out, and the red ladybugs who love to eat scale puffers can be introduced; Of course, drug prevention and treatment can also be carried out