First, the law of occurrence
1, the virus in the cellar cabbage, radish strains or field of welding, vehicle, solitary and other weeds roots overwintering. Seeds can also be poisonous. Soils and tobacco products can also be poisonous and can be infiltrated by micro-wounds through contact with the locust or worms.
2. Pepper virus disease begins in mid-May to late-June, and is in full bloom from June to July. After the high-temperature drought in August, the disease is aggravated. From the seedling stage to the adult stage, the peppers can be infested. As the growth period of the peppers advances, the infection rate decreases in turn and the effect on the yield of the peppers decreases in turn, with the highest infection rate in the 2-4 leaf stage. During the growth stage, production should be blocked by blocking the transfer of poisonous insects and spraying of disease-preventing agents. In addition, the onset of disease and seedlings is too long or the transplanting of the field is related to the adverse climatic conditions of low temperature and dense fog.
3, organic fertilizer is sufficient, soil organic matter content is high, the structure is very good, the incidence of hot pepper virus disease strains is low, the incidence of light, single nitrogen, phosphorus fertilizer, organic matter lack of heavy field disease.
4. The incidence of pepper virus disease is closely related to climatic conditions. Generally, the temperature is higher (33 degrees Celsius), the humidity is lower (relative humidity is less than 60%), and the virus disease occurs more severely under strong light conditions. During the growth of pepper, the more fog days, the greater the intensity of the fog, the more serious the virus disease.
Therefore, high temperature, drought, heavy sorghum, lack of water, fertilizer, and poor growth of plants, aphids or more control is not timely, the incidence of heavy. In addition, there are significant differences in resistance between varieties. Cone pepper is generally more resistant than bell pepper.
Second, prevention and control technology
1, choose resistant varieties.
2, seed self-care: general seed to use 0.1% potassium permanganate solution ah 10% trisodium phosphate soaking 15-20min. Remove and rinse with clean water after germination.
3, disease-free soil nursery, bred disease-free strong seedlings. When transplanting seedlings, disinfect with 0.1% potassium permanganate solution or 10% trisodium phosphate solution. The tool is also best to disinfect.
4. Planting sites should be performed in two rounds with non-solanum vegetables. Do a good job of fertilizer management. During the agricultural operation, the sick and healthy plants are operated separately to avoid contact and transmission. From the seedling stage, we must promptly and continuously guard against flooding.
5. Chemical control: The following agents can be used before or at the onset of disease to spray 0.1% potassium permanganate solution or 0.1%-0.2% zinc sulfate solution. Every 3-5 days, a total of 3-5 times, with good results.
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