Prevention and Control Methods and Technical Key Points for Jujube Spot Disease

Jujube spot disease, also known as jujube brown spot disease, mainly damages the fruit. It can reduce jujube yields by 20%-40%, and in some cases, the resulting inferior fruit accounts for more than 60%, causing huge losses to jujube cultivation. So how should jujube spot disease be prevented and controlled? Let's find out together.

1. Disease Symptoms

Spot disease can infect the fruit when it is as large as a bean. At the initial stage of the disease, needle-sized light-colored to white protrusions appear, which then rapidly enlarge. After they rupture under pressure, bacterial ooze can be seen. Afterwards, variously shaped disease spots appear, gradually enlarging as the fruit grows and develops, and in the later stage causing fruit rot or fruit drop. If prevention and control are not timely, the sores formed on diseased fruit serve as infection points for fungal diseases, making them highly susceptible to other fungal infections, often resulting in cross-infection with other diseases, which is the main cause of massive fruit rot and fruit drop in the later stage.

2. Disease Patterns

This disease is a newly discovered disease in recent years. Based on its onset time and infection characteristics, the infection points that cause the disease should be related to piercing-sucking insect pests, such as mirid bugs. In addition, during the period from bud break to young fruit stage of jujube, heavy rainfall and high soil moisture content can also lead to the prevalence of this disease. Overall, tree vigor is also key to the severity of the disease; plants with weaker tree vigor are more severely affected than those with strong tree vigor, and vice versa. Through research in recent years, spring topdressing also has a certain relationship with the disease. In particular, the heavy and frequent application of chemical fertilizers such as urea and diammonium phosphate can lead to soil nutrient imbalance and aggravate the disease.

3. Prevention and Control Methods

Increase the application of organic fertilizer and potassium fertilizer, improve the soil, strive to increase soil organic matter content, and especially reduce the application of quick-acting chemical fertilizers to create a good environment for the growth and development of jujube trees. Orchard fields should be renovated, especially the weeds and standing water beside ditches and channels, to create an environment unfavorable for the occurrence of diseases and insect pests. In view of the current field situation, prevention and control during the disease occurrence period should be based on the disease patterns, seize the current key timing, and strictly control fruit infection. Effectively carry out pest control on the fruit, such as mirid bugs, cotton bollworm, and jujube leaf roller.

The above is an introduction to the prevention and control methods for jujube spot disease. We hope it can help you. To learn more related knowledge, please stay tuned to us.