Introduction to common diseases and insect pests of citrus and their control methods!

Citrus, also known as red orange, etc., has been cultivated for more than 4000 years. After long-term cultivation and selection, citrus has become a precious fruit for human beings, and it has a wide range of cultivation in China, but oranges will be disturbed by many diseases and insect pests when they are planted. It seriously affects the yield and quality of oranges, resulting in poor appearance and taste of oranges. Then the editor will introduce to you the common diseases and insect pests of citrus and their control methods.

I. ulcer disease

Canker disease is more serious in rainy areas, with brown spots on leaves and fruits, dense spots on fruits and leaves with the development of the disease, and a large number of disease scars on the appearance of fruits, which not only affect the appearance price, but also can not bear storage and decay, and serious fruit loss is caused by serious fruit loss.

Control methods: select seedlings with strong growth and no disease damage when planting, strengthen fertilizer and water management to increase plant disease resistance, regularly spray chemical control, timely removal of diseased leaves to prevent the spread of disease, and then spray 300-fold solution of high-fat film to prevent and control.

Anthrax

Anthracnose is one of the most common and harmful diseases in many fruits, which mainly harms the fruits and also harms the leaves. In the later stage of the disease, the branches and leaves wither and fall off seriously, causing the plant to die, and the leaves appear dark green disease spots during the disease. With the development of the disease, the leaves begin to curl and wilt and finally fall off. When the fruit occurs, dark green oil spots appear on the epidermis, and the disease rapidly extends to the whole fruit. When the rainy season or high air humidity, the disease spot appears white mildew layer, which leads to fruit rot.

Prevention and control methods: cut off the diseased leaves and diseased branches of the plant in winter, remove the residue of the orchard, concentrate on burning or burying deeply to reduce the pathogen, increase the plant disease resistance by applying phosphorus and potassium fertilizer, strengthen the management of timely drainage in the rainy season, remove the diseased site and then spray chemical control when the disease occurs.

Green mildew

Green mold, also known as penicillium, mainly harms the fruit. When the disease occurs, the pathogen invades from the pedicel and wound, causing the fruit to appear watery spots, and the epidermis is easy to break. With the development of the disease, there is a white mildew layer. This layer of mold will gradually become cyan or green over time, resulting in fruit rot.

Prevention and control methods: the fruit is only harvested when it is ripe, be careful not to appear wounds when harvesting, the best harvest time is not in cloudy and rainy weather, and put in a cool and ventilated place for about a week before storage. The storage area must be dry, clean and not wet. Spraying thiabendazim suspension 400-600 times when you get sick can be prevented.

IV. Insect pests

The main pests of oranges are red spiders, scale insects and whitefly, which mainly harm fruits and leaves, which often live in groups to absorb juice on the back of leaves, resulting in leaf withering and shedding, resulting in poor plant growth, affecting yield and quality.

Prevention and control methods: when overwintering, the residue of the orchard is cleaned, burned or buried deeply, and then the eggs of the plant are scraped off to reduce the source of worms. The damage can be controlled by natural enemies or by chemical spraying.

Summary: the above is about the citrus common diseases and insect pests and control methods related to the introduction, I hope to help friends in need!