Control methods of common diseases and insect pests in citrus

Orange is a common fruit in the south, it is rich in vitamin c, it is a favorite fruit, but when growing, oranges will suffer from many diseases and insect pests, seriously affect the yield and quality, resulting in poor appearance and taste of oranges. The following pro-agricultural network will bring you the common pest control methods of oranges, let's learn about it. 、

1. Ulcer disease

Canker disease is more serious in rainy areas, when the disease leaves and fruits appear brown spots, with the development of the disease, fruits and leaves are covered with spots. The light ones have a large number of disease scars on the appearance of the fruit, which not only affect the appearance and price, but also do not bear storage and rot easily, and the serious ones cause the fruit to fall off and lose seriously.

Control methods: select seedlings with strong growth, disease-free and damage when planting, strengthen fertilizer and water management, increase plant disease resistance, and spray chemical control regularly. When the disease occurs, the diseased leaves and diseased leaves should be removed in time to prevent the spread of the disease, and the 300-fold solution of high-fat film should be sprayed to prevent and control the disease.

2. Anthrax

Anthracnose is one of the most common and harmful diseases in many fruits, which mainly harms fruits as well as leaves. In the later stage of the disease, anthracnose causes branches and leaves to wither and fall off, fruit rot and, in serious cases, plant death. When the disease occurs, the dark green disease spot appears, and with the development of the disease spot becomes brown, the leaf begins to curl and atrophy, and finally falls off; when the fruit occurs, the dark green oil spot appears in the epidermis, and the disease rapidly extends to the whole fruit. When the rainy season or air humidity is high, the disease spot appears white mold layer, resulting in fruit rot.

Control methods: cut off the diseased leaves and branches of the plant in winter, remove the residue of the orchard, burn it or bury it deeply, reduce the pathogen, increase the application of phosphorus and potassium fertilizer, and increase the disease resistance of the plant. Strengthen the management, timely drainage in the rainy season, remove the lesion when the disease occurs, and spray chemicals for prevention and treatment.

3. Green mold

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

Prevention and treatment: the fruit is only harvested when it is ripe, be careful when harvesting, do not appear wound, harvest time had better be in sunny weather, not in cloudy and rainy weather. After harvest, put it in a cool and ventilated place for about a week before it is stored in the storage. the storage place must be dry and clean, not wet. When the disease occurs, spraying thiabendazim suspension 400 × 600 times can be prevented and treated.

4. Insect pests

Orange has many insect pests, mainly red spiders, scale insects, whitefly, they mainly harm fruits and leaves, often live in groups on the back of leaves to absorb juice, resulting in leaf withering and shedding, resulting in poor plant growth, affecting yield and quality.

Prevention and control methods: when overwintering, clean up the residue of the orchard, burn it centrally or bury it deeply, and then scrape off the eggs of the plant to reduce the source of worms. Natural enemies can be used to control the damage, and chemical spraying can also be used to control it.

The above are the common prevention and control methods of citrus diseases and insect pests brought by the pro-agricultural network. There are more than 400 kinds of orange diseases and insect pests. Here are some of the more common ones. I hope they can help you with more agricultural knowledge. Please pay attention to the pro-agricultural network.