Detailed Explanation of the Latest Control Methods for Winter Jujube Spot Disease

Winter jujube spot disease, also known as winter jujube brown spot disease, mainly damages the fruit, can reduce winter jujube yields by 20%-40%, and the resulting defective fruit can account for more than 60%, causing huge losses to winter jujube cultivation. So how should winter jujube spot disease be 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 onset, needle-sized light-colored to white protrusions appear, which then rapidly enlarge; after they rupture under pressure, visible bacterial ooze emerges. Afterward, lesions of various shapes appear and gradually enlarge as the fruit grows and develops, later causing fruit rot or fruit drop. If control is not timely, the scabs formed on diseased fruit become infection points for fungal diseases, making them highly susceptible to other fungal diseases and often leading to cross-infection with other diseases, which is the main reason for large-scale fruit rot and fruit drop in the later stage.

2. Disease Occurrence Patterns

This disease is newly discovered 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 winter jujube sprouting to the young fruit stage, heavier rainfall and higher soil moisture content can also lead to the prevalence of this disease. Overall, tree vigor is also key to the severity of the disease: weaker trees are more severely affected than stronger trees, and vice versa. Through research in recent years, spring topdressing is also somewhat related to its occurrence, especially when urea, diammonium phosphate and other chemical fertilizers are applied in large amounts and frequently, which can cause soil nutrient imbalance and aggravate the disease.

3. Control Methods

⟦NL>Increase the application of organic fertilizer and potassium fertilizer, improve the soil, strive to raise the 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 winter jujube trees. The orchard should be renovated, especially by clearing weeds and standing water beside ditches and channels, to create an environment unfavorable for the occurrence of diseases and pests. In view of the current field situation, control during the disease occurrence period should follow the disease occurrence patterns, seize the current key timing, and strictly control fruit infection. Earnestly carry out pest control on the fruit, such as mirid bugs, cotton bollworm, and jujube leaf roller.

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