What are the common methods for controlling pests and diseases of carambola?

Carambola is a fruit we commonly see, rich in nutrients, with a stable market price and a wide planting area. However, during the growth of carambola trees, they are often troubled by pests and diseases. In mild cases, this causes poor plant growth and reduced yield; in severe cases, it causes plant death and total crop loss. For growers, this means huge economic losses. So what pests and diseases can carambola suffer during growth? And how should they be controlled? Come to Qinnong Web and take a look at the common pest and disease control methods for carambola.

1. Anthracnose

Anthracnose is one of the common and more harmful diseases of carambola. It only harms the fruit of carambola. This disease generally occurs during the fruit ripening stage. In addition, during transportation, the fruit can also become infected because of wounds on its surface. Its pathogen overwinters in branches and fruit. When the temperature rises the following year, it begins to reproduce and spread rapidly with the help of wind, rain, and insects. It is especially severe during periods of high temperature and heavy rain. When the disease occurs, brown lesions appear on the fruit surface. As the disease develops, the lesions gradually expand, and multiple lesions can form large dark brown patches. The flesh inside the lesions has already rotted and gives off an alcoholic smell.

Control methods: Before overwintering, combine pruning with the collection of diseased branches, dead branches, mummified fruit, and fallen fruit on the ground, and burn or bury them deeply in a centralized manner to prevent the pathogen from overwintering on the plants. During the hot and rainy season, strengthen orchard management, pay attention to drainage, improve air circulation, and lower air humidity. Increasing the application of phosphorus and potassium fertilizers can improve the disease resistance of the plants. After a large-scale outbreak, spray Bordeaux mixture or copper oxychloride in the orchard for control.

2. Red spot disease

Red spot disease is a fungal infection. It mainly harms the leaves of the plant. When the disease occurs, small yellow lesions appear on the leaves. As the disease develops, the lesions gradually spread and merge, forming round or irregular lesions. The lesions are initially red and gradually turn grayish-white or grayish-brown. In the end, the leaves wither and fall off.

Control methods: Strengthen management, increase the application of phosphorus and potassium fertilizers, and enhance tree vigor and disease resistance. In spring and winter, collect and burn dead leaves and dead branches on the ground and on the plants to prevent the fungus from overwintering. When new leaves grow in spring, spray Bordeaux mixture or copper oxychloride for prevention.

3. Bird-feather moth

The bird-feather moth is a type of moth. It mainly lays eggs on the leaves and branches of the plant. After the eggs hatch into larvae, they harm flowers and young fruit. Because the larvae are red, they are also called red thread worms. Its larvae are extremely small and difficult to see with the naked eye. They gnaw flowers during the flowering stage and gnaw fruit during the fruiting stage. In severe cases, they cause all flowers and fruit to fall off, resulting in total crop loss and causing great harm.

Control methods: Start spraying for control at the flowering stage and continue until the young fruit turns and droops. Spraying can be done 5-6 times a month. Trichlorfon or dichlorvos can be used as the pesticide. When spraying, pay attention to the concentration of the pesticide. If the concentration is low, it will not kill the larvae; if the concentration is high, the pesticide residue in the fruit will be too high and harm consumers' health.

4. Fruit fly

The fruit fly, commonly known as the needle bee, not only harms carambola but is also a common pest of many fruits. It also lays eggs in the fruit. After the eggs hatch into larvae, they harm the fruit, often causing the fruit to rot and fall off, leading to reduced yield. In severe cases, half of the fruit can be damaged, causing huge losses to fruit farmers.

Control methods: Do a good job in orchard epidemic prevention to prevent the spread of pests. Strengthen management, inspect the orchard every day, and promptly remove and collect damaged fruit and fallen fruit when found, burning or burying them deeply in a centralized manner. During the outbreak period, spray specialized pesticides to trap and kill young and adult insects.

The above are the common pest and disease control methods for carambola brought to you by Qinnong Web. The introduction to carambola pest and disease control methods ends here. If you want to learn more, please stay tuned to Qinnong Web.