How to prevent and cure fruit jujube
Jujube shrodding is a disease caused by bacterial and fungal pathogens. The occurrence of the disease is closely related to different species, nutritional imbalances, and abnormal climate effects. In the northern jujube region, disease usually begins in mid-July to mid-August, and the temperature is high. When the rainfall is high, the onset is early. In the middle of August to early September, the coloring period of jujube fruit is the prosperous period. In case of rain or rain The weather is easy to break out. Excessive application of nitrogen fertilizer, nutritional imbalance, more frequent occurrence of fruit shrinkage. With less fertilization, nutrient deficiency and fruit shrinkage can also occur.
Prevention is as follows:
1. Choose plant resistant varieties.
2. Strengthen the management of jujube trees and reduce the incidence of crusted diseases. Increase farm manure, increase tree vigor, and improve the disease resistance of jujube trees. In autumn (after August 20th), apply 25% organic-inorganic compound fertilizer 40kg plus biological bacterial fertilizer 1kg + boron fertilizer 15g or borax 5g, and apply 1 / 3 diammonium phosphate fertilizer + 2/3 urea compound fertilizer in summer. ~ 2kg. During the period of high temperature and drought from June to August, the number of waterings was determined according to weather conditions, and the requirements for jujube fruit production for water and fertilizer were met. Reasonable pruning is conducive to jujube tree ventilation.
3. Chemical control.
1 Jujube blossomed about 30%, sprayed with 300 times borax + 10 ~ 20mg/kg gibberellin + 0.9% avermectin 5000 times. Spray once every 7 days and spray twice.
2 During the expansion of young fruit (mid-July to late August), use 10% difenoconazole (Shigao) 1500 times liquid + 72% agro streptomycin 4000 times liquid + boron calcium treasure 1000 times liquid + 0.9% Abamectin 5000 times or 2.5% lambda-cyhalothrin EW (Kung Fu) 2500 times, sprayed once every 10 days, both anthrax, black spot and insect pests.
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