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I. Time and symptoms of onset At the beginning of July, the phloem exposed to the rhizome of 1 to 3 cm of the surface of the pepper was infected by the pathogen. At the beginning of the disease, it was dark green water-immersed 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 takes only 5 to 6 days. After one week, the diseased plants are completely withered and the fruits are not harvested.
Second, the cause and path of the disease Phytophthora capsici will rapidly develop in high temperature, high humidity environment, the amount of bacteria is high. In the case of dryness and ventilation, the survival rate is low, and after 2 to 4 days, the pathogens will all 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 should be more than 2 years, and the implementation of high temperature weather less watering, low temperature weather watering sooner or later, to avoid noon watering management methods, The water is watered so as not to dip 2/3 of the ridge height. 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 use 50% ruthenium copper to 200 kg of water, after dilution, spray or apply 50 kg / 667 square meters of liquid to the base of the stem of the plant, severely use the same dose of liquid to fill the roots, also It can achieve the purpose of chemical prevention and control of the spread of this disease. 2 In the disease center plot, 165 kg of water was treated with 0.3% copper sulphate. After dilution, the roots were planted one by one, and the incidence of local plots could also be controlled. After investigation, the control rate reached 92%.
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. From 2002 to 2003, we conducted the field control experiment of the disease in a vegetable farm in Qinghe County. The results showed that the incidence of uncontrolled plots was over 80%, and the serious plots were even closed, but the plots for prevention and control were obtained. A good economic benefit.
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