Viral disease is a systemic disease that can damage leaves, flowers and fruits at the same time. The causes of viral diseases are complicated. There are several pathogens such as tobacco mosaic virus, alfalfa mosaic virus and cucumber mosaic virus, which are caused by various pathogens. The symptoms are slightly different and the degree of harm varies.
1. Viral disease is a symptom: the viral disease on pepper is mainly mosaic virus disease. It often occurs in the top leaves, and the symptoms are leaf mosaic, yellowing, and leaf rolling; the plants appear to shrink or become streaked on the fruit, and crack when severe. When several viruses are combined to infect, it causes streaking symptoms, and the symptoms of dark brown streaks appear on the leaves and fruits. When it is serious, the whole plant leaves are caused, and the light and effect of the pepper are severely blocked. Sometimes the leaves of the plants appear on the individual plants. Symptoms, new leaves do not stretch, needle-like, plant growth slow or "crazy" or top blackening, necrotic topovirus disease.
2. Incidence conditions: Capsicum virus disease generally occurs when the temperature rises in spring or when the temperature in summer is high. When the pepper encounters high temperature, drought and Other conditions that are not conducive to plant growth during the growth process, it is easy to be infected with viral diseases, especially in white powder. When pests such as cockroaches and locusts occur, the chance of contracting viral diseases increases. The viral disease of pepper is generally the peak period from March to April, and sometimes the plant is susceptible to disease due to seed poisoning. In the case of low temperature in winter and weak growth of peppers, it is easy to show mild viral symptoms such as mosaics and slow growth. The spread of the disease is generally transmitted indirectly through the pests that suck the mouthparts or the wounds caused by humans. It is necessary to grasp the law of the occurrence of viral diseases, and to achieve comprehensive results by taking various measures to prevent prevention.
3, prevention methods: 1 seed treatment. Seeds should be immersed in water for 3 to 4 hours before sowing, then soaked in 10% trisodium phosphate solution for 3-4 hours or soaked in 0.1% potassium permanganate solution for 30 minutes. 2 disease prevention first treatment of insects. After the temperature rises, the white mites and mites often occur in the shed. Pay attention to the timely control of pests. The insects can be controlled by insects and insecticides to control the pests. The number of meshes for obstruction must be greater than 60 mesh, and the agent should be contacted and internally sucked; be careful to spray tightly and thoughtfully.
4, improve the growth environment: by adjusting the temperature, light and reasonable water and fertilizer supply, to ensure the robust growth of plants, enhance the plant's anti-virus ability.
5, chemical control: you can use the virus spirit or plant disease 1000 times prevention. Virus A plus once again (or other agents that kill mites, whitefly mites) plus harvest No. 1 (or Yunda 120) spray 3 times, every 5 to 7 days.
From: Rural Volkswagen
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