How to prevent and control the fruit shrinkage disease of jujube caused by fruit shrinkage disease

Jujube fruit shrinkage disease is a disease caused by bacteria and fungi. The occurrence of the disease is closely related to different varieties, nutritional imbalance and abnormal climate. The disease generally begins to appear in the northern jujube area from the middle of July to the first and middle of August. The disease occurs early when the temperature is high and the rainfall is high, and the coloring period of jujube fruit is the peak period from mid-August to early September. It is easy to break out in case of continuous rain or rainy night and sunny day. Excessive application of nitrogen fertilizer, nutrition imbalance, fruit shrinkage disease occurred more. A small amount of fertilizer, lack of nutrients, fruit shrinkage disease will also occur seriously. Prevention and treatment are as follows:

Jujube fruit shrinkage disease

1. Disease-resistant varieties were selected.

two。 Strengthen jujube tree management and reduce the occurrence of fruit shrinkage disease. Increase the application of farm manure, enhance the tree potential, and improve the disease resistance of jujube trees. In autumn (after August 20), 25% organic-inorganic compound fertilizer was applied for 40 kg plus biological bacterial fertilizer 1kg + boron fertilizer 15g or borax 5g, summer topdressing 1kg diammonium phosphate fertilizer + 2max urea fertilizer, and plant 1~2kg. During the period of high temperature and drought from June to August, the watering times were determined according to the weather and rainfall to meet the requirements of water and fertilizer for jujube fruit growth. Reasonable pruning is beneficial to the ventilation and light transmission of jujube trees.

3. Chemical control.

① jujube trees blossomed about 30% and were sprayed with 300x borax + 10~20mg/kg gibberellin + 0.9% avermectin 5000 times. Spray once every 7 days, twice in a row.

During the expansion period of ② jujube (from mid-July to late August), 10% difenoconazole (Shigao) 1500 times solution + 72% agricultural streptomycin 4000 times solution + 0.9% avermectin 5000 times solution or 2.5% cyhalothrin EW (Kung Fu) 2500 times solution was sprayed every 10 days to treat anthracnose, black spot and insect pests.