The Latest Control Methods for Navel Orange Citrus Canker

Navel orange is a common and suitable fruit in our lives, deeply loved by many people, but during cultivation, citrus canker is extremely harmful to it, and the incidence of citrus canker is also higher than other diseases. With the development of the navel orange industry, this disease has become increasingly serious, severely harming the development of the navel orange industry. So how should navel orange citrus canker be controlled? Let's take a look together.

1. Disease Symptoms

Citrus canker harms leaves, fruit and branches. After leaves are infected, yellow or yellow-green oil-soaked spots appear on the petioles. After the spots expand, they become round, the epidermis at the lesion ruptures, the center cracks in a crater-like shape, and there is a yellow halo around it. When branches and fruit are infected, the symptoms are similar to those on leaves, but the lesions on branches are more raised, though without a yellow halo. Fruit has a yellow halo when unripe, and the halo disappears after ripening.

2. Disease Pattern

Citrus canker is a bacterial disease. Its pathogen lurks in leaves, branches or fruit to overwinter, especially in autumn shoots, which are its main lurking site. After the following spring, when temperatures warm up, it begins to spread with the help of wind, insects, and contact between branches and leaves during the rainy season, entering through stomata or wounds, and begins to cause disease after lurking for about one month. It generally occurs at high incidence during hot and rainy seasons, and can occur every time the plant sets fruit or sprouts shoots, and navel orange itself is extremely susceptible to this disease.

3. Preventive Measures

For this disease, preventive measures must first be taken. After the autumn and winter harvest, the orchard must be thoroughly cleaned, and residual branches, fallen leaves, and infected branches, leaves and fruit should be centrally burned or deeply buried to reduce the pathogen, and a fungicide should be sprayed throughout the orchard to kill the bacteria. Do a good job in fertilizer and water management for the plants, apply sufficient base fertilizer and increase phosphorus and potassium fertilizer to improve the disease resistance of the plants. At the same time, attention should also be paid to drainage and ventilation to reduce humidity in the orchard. In addition, this disease mainly invades through wounds, so the plants must be prevented from being wounded, so as not to give the pathogen an opportunity.

4. Medication Treatment

After the beginning of spring, before new shoots sprout, spray Kuifuling and insecticide once. This can eliminate the sources of pests and diseases after overwintering, with good results. Before summer shoots and autumn shoots, it can be sprayed 2-3 times. After winter orchard clearing, spray Bordeaux mixture and lime sulfur compound once, and Chinese herbal fungicide can also be sprayed year-round.

The above is an introduction to the control methods for navel orange citrus canker. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.