What are the control methods for navel orange canker disease?

The navel orange is a common and popular fruit in our daily life, loved by many people, but during cultivation, canker disease causes great harm to it, and the incidence of canker disease is also higher than that of other diseases. With the development of the navel orange industry, this disease has become increasingly serious, severely endangering the development of the navel orange industry. So how should navel orange canker disease be controlled? Let's take a look together with the editor.

1. Disease symptoms

Canker disease 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 and have no yellow halo. On fruit, there is a yellow halo when unripe, and the halo disappears after ripening.

2. Disease patterns

Canker disease is a bacterial disease. Its pathogen overwinters latent in leaves, branches or fruit, especially in autumn shoots, which are its main latent sites. After early spring of the following year, as temperatures warm up, it begins to spread with the help of wind, insects, and contact between branches and leaves in the rainy season, and invades through stomata or wounds, with symptoms beginning to appear after about one month of latency. It generally occurs at a high rate during hot and rainy seasons, and can break out each time the plant sets fruit or sprouts shoots. Moreover, the navel orange itself is highly susceptible to this disease.

3. Preventive measures

For this disease, preventive measures must first be taken. After the autumn and winter harvest, thoroughly clean the orchard, gather residual branches and fallen leaves as well as diseased branches, leaves and fruit, and burn or bury them deeply to reduce the pathogen, and spray fungicides 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 plants' disease resistance. At the same time, also pay attention to drainage and ventilation to reduce humidity in the orchard. In addition, this disease mainly invades through wounds, so prevent the plants from being wounded, so as not to give the pathogen an opportunity.

4. Medication treatment

After early spring, before new shoots sprout, spray Kuifuling and insecticide once. This can eliminate overwintered disease and pest sources, with relatively good results. Before summer shoots and autumn shoots, it can be sprayed 2-3 times. Agricultural streptomycin can be used, and after winter orchard cleaning, spray Bordeaux mixture and lime sulfur compound once. Chinese herbal fungicides can also be sprayed year-round.

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