Symptoms of the onset of the disease can be all the reproductive period. During the seedling stage, the veins of the heart and the leaves were first chlorotic and transparent (called "Mingmai"), and they were greenish along the veins, followed by the floral leaves and shrunken and became brittle, and the heart was distorted. In the adult plant stage, the diseased plant leaves or half shrinkage; the diseased plant usually has a dwarf deformity, sometimes the leaf is densely brown, and the root system of the diseased plant is underdeveloped; the fibrous roots are less, and the root becomes light brown; the diseased plant leaves become wrinkled. Shrink into a group, hard and brittle leaves, there are many brown spots, there are brown necrotic strips on the leaf veins, and there are cracks, severe dwarf diseased plants, deformity, non-ball. The diseased seedlings were planted and bred the following year. The pods were short and curved, and the leaves were small and hard with clear veins and mosaics. The fruit is thin and curved, the seed germination rate is low, and the severely diseased plant strain occurs. The peduncle dies when it is not extracted.
Disease factor 1 species: The resistance of different Chinese cabbage varieties to virus disease has significant differences, such as the resistance of green gang variety to white gang variety. 2 Adjacent crops: In the case of adjacent plants such as radish cabbage and cruciferous vegetables, viruses can infect each other and cause illness. 3 Climate: High temperatures during the seedling stage, drought, and serious occurrences. 4 sowing date: sowing cabbage sowing early in the fall, the incidence of heavy. 5 Growth period: Before the leaf stage, the seedling is most susceptible to virus infection.
Control measures 1 selection of disease-resistant varieties. Such as Beijing New 3, Green Star 80. 2 Select disease-free strains. When harvesting in autumn and winter, disease-free strains are strictly selected; in the spring, the strains are removed to reduce the source of the virus. 3 to avoid the same type of continuous production. Avoid continuous or adjacent work with cruciferous vegetables and reduce sources of transmission. 4 appropriate sowing. In the northern regions, suitable sowing dates are three days before and after the beginning of autumn. As disease prevention measures, suitable late sowing should be carried out during appropriate sowing dates. 5 Improve cultivation techniques. Deep plowing, killing weeds and reducing the source of infection. Increase organic fertilizers, mix phosphorus and potash fertilizers, and increase disease resistance. Avoid drought and timely remove weak seedlings and diseased seedlings. 6 Seedling period is a period of virus disease susceptibility, it should be sprayed to prevent and cure in time. 7 Control locusts in time to reduce the transmission of virus vectors. In addition to chemical control, it can be covered with gauze. 8 appropriate pharmaceutical control.
Author: Liaoning East Asia Seed Industry Co., Ltd.
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