Spinach is a common fruit that is loved because it is rich in vitamins. In the process of spinach growth, powdery mildew is a disease that has to be prevented. The following is a small series to introduce the symptoms and control methods of spinach powdery mildew.
Symptoms of spinach powdery mildew
Spinach powdery mildew is mainly harmful to leaves, but also can damage stems and pods. The leaves are damaged, and the leaves begin to produce white powdery yellowish spots, which gradually expand into irregularly shaped powder spots and merge with each other. The lesions are covered with a layer of white powder, with purple or brown spots on the back of the leaves. . Stem pods are damaged, stems are shrinking, yellow, and pods are shrinking and shrinking. Finally, a small black spot appears on the lesion, which is the closed capsule.
The occurrence of spinach powdery mildew
In cold places, the bacteria overwinter on the soil surface sickness with closed capsules. When the conditions of Hunchun are suitable, the ascospores are produced for initial infection and spread by airflow. After the onset, the diseased part produces conidia, which is transmitted by airflow and then infected. The protected area is warm and cold at night, with high temperature difference, high humidity and easy condensation. It is suitable for powdery mildew, but under dry conditions, the bacteria can still germinate and the incidence is very serious.
Prevention and treatment method of spinach powdery mildew
Agricultural control:
1 Before sowing or transplanting, or after harvesting, remove the weeds in the field and surrounding areas, concentrate on burning or fattening; deepen the ground to kill cockroaches, dry the soil, promote the decomposition of the sick body, reduce the source of the disease and the source of insects.
2 The nursery soil should be made of sterile soil and used for more than three weeks before use;
3 and non-undergraduate crop rotation, water and drought rotation is best.
4 Use disease-resistant varieties and select disease-free, coated seeds. If uncoated, the seeds must be sterilized with seed dressing or soaking agent.
5 seedling transplanting, covered with medicinal soil after sowing, spray a deworming sterilizing agent before transplanting, which is the key to disease prevention.
6 timely broadcast early, early transplanting, early soil, early fertilization, timely cultivation of soil, cultivation of strong seedlings. Eliminate disease and weak seedlings during transplanting.
7 Select the convenient irrigation and drainage field, open the drainage ditch, reduce the groundwater level, and reach the rain stop without water; clear the ditch system after the heavy rain to prevent moisture retention and reduce the humidity in the field, which is an important measure for disease prevention.
8 soil with more soil pathogens or underground pests, applied or sterilized in the field before planting,
9 Applying compost or decomposed organic fertilizer prepared by enzyme bacteria, without using fertilizer, the applied organic fertilizer must not contain the underage crop residues.
10 Using soil testing and formula fertilization technology, appropriate application of phosphorus and potassium fertilizer, strengthening field management, cultivating strong seedlings, enhancing plant disease resistance, and helping to reduce disease...
11 timely control of pests, reduce plant wounds, reduce the path of pathogens; remove diseased leaves and diseased plants in time, and bring out burned fields, application of points or quicklime.
12 High temperature and drought should be scientifically watered to improve the humidity in the field and reduce the damage and transmission of mites and ash. Continuous irrigation and flooding are strictly prohibited. Preventing water droplets from splashing when watering is an important measure to prevent the disease.
Chemical control:
First, seed dressing:
Seed dressing with 40% seed dressing double powder with a seed weight of 0.2% can alleviate the disease.
Second, the initial stage of the spraying:
2% Wuyinmycin (Bo-10) water 200 times solution
More than 40%. Sulfur suspension 600 times solution
40% Fuxing EC 8000-10000 times liquid
15% triazolone wettable powder 1500-2000 times liquid
12% green milk copper emulsifiable concentrate 500 times liquid
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