The Latest Control Methods for Common Citrus Pests and Diseases
The orange is a common fruit in the south. It is rich in vitamin C and is a relatively popular fruit. However, during cultivation, oranges suffer from the intrusion of many pests and diseases, which seriously affect yield and quality and result in poor appearance and taste. Below, Qinnong Web brings you the common pest and disease control methods for oranges. Let us learn about them together.
1. Citrus canker
Citrus canker is more severe in rainy areas. When it occurs, small brown spots appear on the leaves and fruit, and as the disease develops, the fruit and leaves become densely covered with spots. In mild cases, a large number of disease scars appear on the surface of the fruit, which not only affects appearance and price but also makes the fruit less suitable for storage and prone to rotting. In severe cases, it causes the fruit to drop, resulting in serious losses.
Control methods: When planting, select seedlings that are strong-growing and free of disease and damage, strengthen fertilizer and water management, increase the plant's disease resistance, and regularly spray pesticides for control. When the disease occurs, promptly remove diseased leaves and diseased fruit to prevent the disease from spreading, and spray a 300-fold dilution of high-fat film for control.
2. Anthracnose
Anthracnose is one of the most common and most harmful diseases of many fruits. It mainly harms the fruit and also harms the leaves. In the later stages of the disease, it causes branches and leaves to wither and drop, and the fruit to rot. In severe cases, it causes the plant to die. When the leaves are affected, dark green lesions appear. As the disease develops, the lesions turn brown, the leaves begin to curl and wilt, and finally drop off. When the fruit is affected, dark green oil-soaked spots and lesions appear on the surface. The disease rapidly expands to the entire fruit. During the rainy season or when air humidity is high, white mold layers appear on the lesions, causing the fruit to rot.
Control methods: In winter, prune off diseased leaves and diseased branches from the plants, clear away debris from the orchard, and burn or deeply bury it in a centralized manner to reduce pathogens. Apply more phosphorus and potassium fertilizer to increase the plant's disease resistance. Strengthen management, drain water promptly during the rainy season, remove diseased parts when the disease occurs, and spray pesticides for control.
3. Green mold
Green mold, also called blue mold, mainly harms the fruit. When it occurs, the pathogen invades from the fruit stalk and wounds, causing water-soaked lesions to appear on the fruit. The surface easily splits, and as the disease develops, a white mold layer appears at the lesions. Over time, this mold layer gradually turns blue or green, causing the fruit to rot.
Control methods: Harvest the fruit only when it is ripe. Be careful during harvest and do not cause wounds. The best time to harvest is in clear weather, not in rainy weather. After harvest, leave the fruit in a cool, ventilated place for about a week before storing it in the warehouse. The storage place must be dry and clean, not damp. When the disease occurs, spraying a 400-600-fold dilution of thiabendazole suspension concentrate can control it.
4. Insect pests
Oranges have many insect pests, mainly red spider mites, scale insects, and whiteflies. They mainly harm the fruit and leaves and often gather on the undersides of leaves to suck sap, causing the leaves to wither and drop, resulting in poor plant growth and affecting yield and quality.
Control methods: During overwintering, clean up debris in the orchard, burn or deeply bury it in a centralized manner, then scrape off the insect eggs on the plants to reduce the source of pests. When damage occurs, natural enemies can be used for control, and chemical pesticides can also be sprayed for control.
The above are the common pest and disease control methods for citrus brought to you by Qinnong Web. There are more than four hundred kinds of pests and diseases of oranges. Here we list several of the more common ones, hoping they can help you. For more agricultural knowledge, please pay attention to Qinnong Web.