Prevent and cure jujube fruit disease
Recently, the growers of the Mentougou fruit tree dialed the 12396 hotline for consultation. How can the disease be controlled? The hotline expert Cheng Lili has answered the following questions:
Jujube fruit disease, also known as jujube wilting fruit disease, date haze disease, etc., is one of the major diseases in China's major jujube areas. Studies have shown that fruit shrinkage is caused by bacterial infection. The occurrence of the disease is closely related to different species, nutritional imbalances, and abnormal climate effects, and is directly related to the damage of the jujube skin. In addition to the naturally worn jujube wounds, diseases can be transmitted from the wounds of sucking mouthparts, such as ticks, leafhoppers, and stink bugs. The occurrence of diseases is closely related to the growth period of jujube fruit. 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 fertilizers inhibited the absorption of boron fertilizer, nutrition imbalance, more frequent occurrence of fruit shrinkage. With less fertilization, nutrient deficiency and fruit shrinkage can also occur. Its prevention and control techniques are as follows:
Selected disease resistant varieties
Selected varieties of anti-crack fruit have a certain effect. The "Gangkang 1", which was selected and bred by the Hebei Provincial Academy of Forestry, is resistant to the disease and can be selected according to local disease severity and needs.
Strengthen management
Increase farm manure, increase tree vigor, and improve the disease resistance of jujube trees. In autumn (after August 20th), the plant applies 25% organic-inorganic compound fertilizer 40 kg plus biological bacteria fertilizer 1 kg plus boron fertilizer 15 grams or borax 5 grams. In the summer, the application of 1 / 3 diammonium phosphate fertilizer + 2 / 3 urea mixed fertilizer, strain applied 1 kg to 2 kg. From June to August, the number of waterings was determined according to weather conditions during high temperatures and droughts. Reasonable pruning will help the jujube trees to transmit light and reduce the incidence.
Chemical control
1 Jujube blossomed about 30%, sprayed with 300 times borax + 10 mg -20 mg/kg gibberellic acid + 0.9% abamectin 5,000 times. Spray once every 7 days and spray twice.
2 During the expansion period of young fruit, use 10% difenoconazole (Shigao) 1500 times liquid + 72% agro streptomycin 4000 times liquid + boron calcium treasure 1000 times liquid + 0.9% avermectin 5000 times liquid or 2.5 % Lambda-cyhalothrin EW (Kung Fu) 2500 times, spraying once every 10 days, concurrent treatment of anthrax, black spot and insect pests.
(Cheng Lili, Assistant Researcher at the Beijing Institute of Agriculture and Forestry Sciences, is engaged in high-efficiency cultivation techniques such as Chinese chestnut and hazelnuts, resource breeding, and molecular biology, etc., and participated in the breeding of the special short chestnut male flower variety “Black Shanzhai No. 7â€.
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