Common diseases of walnut and their control methods

Walnut, almond, cashew nut and hazelnut are known as the four dried fruits in the world. They are widely used as economic crops for food and medicine, and they are widely planted in China. But it is the disease that affects its growth and yield, which makes farmers lose a lot, so what are the diseases and insect pests of walnut? The following pro-agricultural network brings you common walnut diseases and control methods.

1. Walnut powdery mildew

Powdery mildew mainly harms buds and leaf tips, causing leaves to fall off early and, in severe cases, causing plant death. At the initial stage, the leaves begin to fade and turn yellow, slowly the leaves begin to twist, and white powder begins to appear. Brown or black particles appear in the white powder in the later stage.

Control method: when the disease is found, remove the diseased leaf branches in time and burn them centrally, so as not to spread to other parts, and spray them with professional agents.

2. Anthracnose of walnut

Anthracnose mainly harms the fruit, which occurs in the rainy season and weak plants. When the disease occurs, the bacteria enter from the wound, brown or black spots will appear at the affected site, and in severe cases, the fruit will rot and fall off, and the leaves will be withered and yellow.

Prevention and control methods: similarly, we will remove and burn the diseased leaves and branches, strengthen management, prune plants that are too dense, improve the ventilation environment, reduce the growth environment of bacteria, and spray Bordeaux solution in time during the rainy season to prevent diseases. When diseases are found, carbendazim or chlorothalonil can be sprayed to kill the disease.

3. Walnut rot

Rot mainly harms branches, if the disease occurs in the trunk, it is not easy to detect, if the branch is infected, it will lose color and lead to the withering of the branch. Second, there are obvious disease spots in the wound and gradually spread along the branch. The branches will lose water and rot in the later stage of the disease.

Control method: this disease is mainly transmitted by spores, so it is necessary to improve the soil and planting environment and increase the disease resistance of the plant. if the disease is found in time, the disease spot can be scraped off and then sprayed with thiophanate methyl. The trunk can be painted white in winter, which can not only prevent freezing, but also prevent the occurrence and spread of the disease.

4. Insect pests

Walnut has many insect pests, but as long as it is not a large-scale pest, it does little damage to the plant. the main pests are: shell insects, longicorn beetles, beetles and many kinds of moths.

Control method: collect and burn all the fallen leaves or branches in spring, smash all the eggs found, and catch them manually when pests occur. If you find it troublesome, you can use professional insecticides to kill them.

The above are the common diseases and control methods of walnut brought by pro-agricultural network, walnut diseases and insect pests are inevitable, so it is necessary to strengthen management, careful maintenance, can not allow its free growth, otherwise it will cause greater losses.