How to control mustard disease virus disease

Mustard is an annual or biennial herb of Brassica in Cruciferae. It is a famous vegetable native to China. It is a commonly used vegetable cultivated all over the country, mostly distributed in the provinces south of the Yangtze River. The main and lateral roots of mustard are distributed in a soil layer of about 30 cm. The stem is a short shrinking stem, and the leaves are in the shape of oval, oval, obovoid, lanceolate, etc., with green, dark green, light green, yellow-green, green lines or purplish red. It is rarely cultivated in Europe and the United States and originated in Asia. Li Shizhen's Compendium of Materia Medica records the medical value of medical mustard. Mustard like cold, cool and moist, avoid heat, drought, slightly resistant to frost. The average temperature suitable for seed germination was 25 ℃. The average temperature for leaf growth of mustard is 15 ℃, and the temperature for edible organ growth is 8-15 ℃. But stem mustard and heart mustard require lower temperature for the formation of edible organs, and leaf mustard generally requires less temperature.

Growth habits of mustard

Budding, bolting, flowering and fruiting need to go through the conditions of low temperature vernalization and long sunshine. Autumn sowing is dominant in the north and south of China, the Yangtze River Basin, southwest and South China are harvested in winter or the next spring, and the north is harvested before frost. Leaf mustard eaten by young plants can be sown in spring or summer in the south. During the growing period, it is easy to bolt when exposed to long sunshine, which affects the growth of edible organs.

Mustard is rich in vitamin A, vitamin B, vitamin C and vitamin D. The specific effect is refreshing, mustard contains a lot of ascorbic acid, is a highly active reducing substance, participates in the important redox process of the body, can increase the content of oxygen in the brain, stimulate the use of oxygen in the brain, and refresh the brain. Relieving fatigue.

How to control mustard disease virus disease?

What is a viral disease?

Viral disease is also known as gu Ding disease, insane disease. Can harm mustard, radish, Chinese cabbage, cabbage, cabbage and other cruciferous crops. It is common in all parts of the country, and the harm is serious.

Symptoms and causes of mustard disease virus disease:

The main results are as follows: 1) symptoms can occur in all growth stages. At the beginning of the disease, the heart leaves appear light and translucent veins, then fade green along the veins and become light green and thick green flowers and leaves. The leaf blade is wrinkled and uneven, sometimes with brown spots or stripes on the veins. In the later stage, the leaves became hard and brittle and gradually yellowed. In severe cases, the diseased plant dwarfs and stops growing. The root system is underdeveloped and the section is yellowish brown. Seed plant disease, pedicel deformity, flowers and leaves, small seed pods, less seeds.

2) the disease is a viral disease, which is caused by a variety of viruses. Viruses can survive the winter in many ways. Some overwintered on seeds, perennial weeds in the field and the remains of diseased plants, some overwintered on seed plants, and some overwintered in protected areas. It was transmitted by aphids and contact in the following year. High temperature and drought are beneficial to the occurrence of aphids and the prevalence of virus diseases. The disease is serious under the conditions of continuous cropping, neighboring diseased crops, insufficient fertilizer, poor growth and so on. The disease was easy to be infected in the seedling stage before 6-7 leaves, and decreased after the adult stage. There were also significant differences in disease resistance among different varieties. Prevention and control methods of mustard disease virus disease:

Most of the new ① resistant varieties bred by domestic breeding units are more resistant.

② selected disease-free plants when harvested in autumn and winter, disease-free plants were strictly selected. This can reduce the source of virus in the following year and reduce the virus-carrying seeds.

③ reasonable arrangement of stubble cruciferous vegetables should avoid continuous cropping or adjacent cropping to reduce the source of transmission.

④ autumn sowing late sowing in autumn and winter cultivation should be timely late sowing. The occurrence of the disease can be reduced by avoiding the high temperature and dry season in the seedling stage and sowing in the cold season which is not suitable for disease.

Avoiding aphids in ⑤ seedling stage is the susceptible period of virus disease, so we should spray in time to avoid the spread of aphids.

⑥ field management deep ploughing, eliminate weeds, reduce the source of infection. Increase the application of organic fertilizer, combined with phosphorus and potassium fertilizer, promote the robust growth of plants and improve disease resistance. Strengthen water management to avoid drought. Pull out weak and diseased seedlings in time.

⑦ timely control of aphids can be found in the pest section.

The following agents can be used before ⑧ prevention and treatment: high lipid membrane 200,500fold solution, 83 enhancer solution 10fold, virulent 500fold liquid, 20% virgin 400600fold liquid, antiviral agent 1 300400fold liquid. One of the above drugs was sprayed 3-4 times every 7-10 days in the seedling stage.