Detailed Explanation of Techniques and Methods for Controlling Winter Jujube Fruit Shrink Disease

Winter jujube is a fruit that everyone loves very much, generally marketed in October each year, and winter jujube fruit shrink disease is a common disease during winter jujube cultivation, which can seriously affect fruit yield and quality. So how should winter jujube fruit shrink disease be controlled? Let's take a look together.

1. Disease Symptoms

This disease mainly harms the fruit of winter jujube, often causing rotten fruit and premature dropping. When the disease occurs, first a pale yellow halo lesion appears on the shoulder or body of the affected fruit, then gradually expands to form a concave, irregular pale yellow lesion, and scattered small round brown spots also appear on the fruit skin. At this point, if the fruit is cut open, the flesh will be found to be earthy yellow and soft, with sponge-like necrosis of the diseased tissue, the diseased fruit shrivels, and the flesh tastes bitter, completely losing its edible value and causing relatively large economic losses.

2. Disease Patterns

Winter jujube fruit shrink disease, also known as black rot, brown rot, and wilt disease, is a bacterial disease. The pathogen safely overwinters in diseased fruit, and the following year enters through fruit wounds with wind and rain or directly penetrates the fruit skin. August to September is the peak period for this disease. After infection, the diseased fruit gradually dries, shrinks, and becomes sunken, and the fruit skin wrinkles and falls off. The severity and urgency of the disease are closely related to factors such as temperature, humidity, and insect pests, especially during continuous rainy weather or alternating periods of intermittent sunshine and rain with high temperature and high humidity, which can easily cause an outbreak of this disease, causing large numbers of nearly ripe winter jujubes to drop and resulting in severe losses. In addition, mechanical damage caused by friction, and the sucking damage of leafhoppers, scale insects, mites, and others, also easily allow the pathogen to invade and lead to disease.

3. Control Methods

First, after fruit harvest each year, the orchard must be thoroughly cleaned, completely eliminating diseased and rotten fruit from the orchard, and these should be centrally burned or deeply buried to eliminate overwintering pathogens and reduce the incidence rate the following year. After autumn fruit harvest, increase the application of organic fertilizer and phosphorus and potassium fertilizer to strengthen tree vigor and improve the disease resistance of the plants. Generally, the period of fruit coloring is the peak period of disease occurrence, so 15-20 days before harvest is the key period for control. The pesticide can be sprayed once every 10 days. In addition, attention should also be paid to controlling the damage of piercing-sucking pests such as leafhoppers, tortoise wax scales, and peach fruit borers, so as to reduce wounds on jujube fruit and lower the pathogen infection rate.

The above is an introduction to the control techniques for winter jujube fruit shrink disease. We hope it can help you. If you want to learn more related knowledge, please keep following us.