Phytophthora capsici, also known as capsicum black stem disease, is a serious bacterial disease caused by Phytophthora capsici infecting the phloem of capsicum causing the death of capsicum. The results of prevention and control tests show that the incidence of uncontrolled plots is as high as 80%, and the serious plots are even closed, but the plots for prevention and control have achieved good economic benefits.
First, the onset time and symptoms of pepper at the beginning of the fruit, the phloem exposed to the surface of the roots 1-3 cm roots were infected by the bacteria. At the beginning of the onset, it was dark green water-invasive lesions, and the lesions were slightly depressed. At the end of the disease, it gradually turns dark brown, the plants and leaves are dry, the fruit shrinks, and the fruit does not fall. The disease course only takes 5-6 days. After one week, the diseased plants are completely withered and the fruits are not harvested.
Second, the cause of the disease and the path through the Phytophthora capsici in the high temperature, high humidity environment will be rapid onset, high bacteria. In the case of dryness and ventilation, the survival rate is low, and after 2-4 days, all the pathogens will die. Field survey results show that the low-lying area of ​​the pepper field is prone to the disease after high temperature and flooding. Once every irrigation, the scope of the disease has been expanded, and there is often a phenomenon of dying in the ditch. Because the pathogen can produce zoospores, it can be considered that the water is the main route of disease transmission, and the high temperature atmosphere is the basis for disease occurrence. Large water irrigation and heavy rain are the key to the spread of the disease.
Third, preventive measures 1, physical control and reasonable rotation and high ridge cultivation, and non-solanth crop rotation to achieve more than 2 years, and the implementation of high temperature weather less watering, low temperature weather morning and evening watering, to avoid noon watering management methods, The watering of the water is subject to 2/3 of the height of the ridge. After the diseased plant occurs, it should be removed in time, buried or burned. The diseased plant plot should be treated with lime water for soil disinfection.
2, drug control 1 with 50% ruthenium toxic copper water 200 kg, diluted with 50 kg / 667 square meters of liquid spray or coated on the stem base of the plant, severe plots with the same dose of liquid irrigated, It can also achieve the purpose of chemical prevention and control of the spread of this disease. 2 In the disease center plot, use 0.3% copper sulphate to 165 kg of water, dilute the roots of the plant, and also control the incidence of local plots. After investigation, the control rate can reach 92%.
First, the onset time and symptoms of pepper at the beginning of the fruit, the phloem exposed to the surface of the roots 1-3 cm roots were infected by the bacteria. At the beginning of the onset, it was dark green water-invasive lesions, and the lesions were slightly depressed. At the end of the disease, it gradually turns dark brown, the plants and leaves are dry, the fruit shrinks, and the fruit does not fall. The disease course only takes 5-6 days. After one week, the diseased plants are completely withered and the fruits are not harvested.
Second, the cause of the disease and the path through the Phytophthora capsici in the high temperature, high humidity environment will be rapid onset, high bacteria. In the case of dryness and ventilation, the survival rate is low, and after 2-4 days, all the pathogens will die. Field survey results show that the low-lying area of ​​the pepper field is prone to the disease after high temperature and flooding. Once every irrigation, the scope of the disease has been expanded, and there is often a phenomenon of dying in the ditch. Because the pathogen can produce zoospores, it can be considered that the water is the main route of disease transmission, and the high temperature atmosphere is the basis for disease occurrence. Large water irrigation and heavy rain are the key to the spread of the disease.
Third, preventive measures 1, physical control and reasonable rotation and high ridge cultivation, and non-solanth crop rotation to achieve more than 2 years, and the implementation of high temperature weather less watering, low temperature weather morning and evening watering, to avoid noon watering management methods, The watering of the water is subject to 2/3 of the height of the ridge. After the diseased plant occurs, it should be removed in time, buried or burned. The diseased plant plot should be treated with lime water for soil disinfection.
2, drug control 1 with 50% ruthenium toxic copper water 200 kg, diluted with 50 kg / 667 square meters of liquid spray or coated on the stem base of the plant, severe plots with the same dose of liquid irrigated, It can also achieve the purpose of chemical prevention and control of the spread of this disease. 2 In the disease center plot, use 0.3% copper sulphate to 165 kg of water, dilute the roots of the plant, and also control the incidence of local plots. After investigation, the control rate can reach 92%.
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