Phytophthora falciparum is one of the major diseases susceptible to infection of Euonymus japonicus. When it is severe, it can cause the whole plant to die. Affected by the special climate of the winter and spring seasons, the Euonymus japonicus is not ideal for greening, and some dead branches will appear, resulting in weakened growth potential of the Cyclovirobuxia, thus reducing the plant's resistance to disease. Some Euonymus japonicus are prone to stalk rot. Especially in the first and second year, the branches are most severely damaged. In the early stages, the stems become brown, the leaves are green, the young shoots droop, the leaves do not fall off, the affected parts of the stems become dark, the cortex shrinks, the endothelium rots, and many tiny blacks are produced. Small sclerotia, at the same time, the victim site develops rapidly and the bacteria invade the xylem, causing the whole plant to die.
First, the pathogenic cause of Euonymus stalk rot caused by pathogens of the semi-known bacteria, the bacteria usually live in the soil rot. As the temperature rises in summer, the soil temperature also rises, and pathogens invade the stems of the seedlings. Especially in high-temperature, low-lying areas, the incidence is more common.
Second, prevention and control measures
1. Strengthen the management and maintenance of seedlings and increase their own resistance to disease.
2. The use of sufficiently mature farmyard manure as a base fertilizer can reduce the incidence of seedlings.
3. Summer seedlings take measures such as taking the shade and other measures to cool, large seedlings can be planted ground cover or grass cover and other methods to destroy the environmental conditions of bacteria.
4. Cut off the diseased branches in time and concentrate them on burning.
5. When the amount of diseased seedlings is small, brush 50 times 50% carbendazim solution or 50 times 25% enemy dewetting oil (propoxazole) can be applied to the stalk at the early stage of disease. When the amount of seedlings is large or the onset of disease, seedlings are generally sprayed with 800 to 1000 times of the bacteria and 2000 to 2500 times of the time. Both methods are performed once every 7 days for 2 to 3 consecutive times, which can play a preventive and therapeutic role.
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