Sophora japonicus is an authentic saprophytic fungus. It usually appears in dead grass mats or soil. only when the right conditions are available will they become pathogenic bacteria. Sponge rot fungus is also a kind of water mold, which can grow well under standing water conditions and on plant debris in ponds. Ponds are an important source of infestation. Sophora japonicus nurseries often appear in the summer. The disease will have large and irregular dead spots, which can cause serious damage in a short time.
Symptom characteristics:
In the early stage of infection, the diseased part was water-stained and necrotic, spreading rapidly in all directions. Large irregular water-stained spots are formed on the stem base and petiole, and the diseased tissue rots in a short period of time. At the same time, a thick white flocculent mold is formed in the disease. The conditions were suitable and the condition developed rapidly, causing the national acacia to die and rot.
onset law:
The disease is caused by the infection of the fungus flagellum Pythium sophorae. Pathogens live through the winter as oospores or mycelium on the surface of the soil. When conditions are suitable, zoospores splash back onto the lower leaves through rain or field watering, causing disease. However, the disease is only affected by a few cases or suffers severely from the drainage head.
Bacteria like a warm, humid environment, with an onset temperature of 10-30°C and a relative humidity of over 95%. The main incidence of the disease in Zhejiang and the middle and lower reaches of the Yangtze River is from April to June. Fields with low-lying terrain, accumulated water in the field, heavy soil, high groundwater level, and high humidity in the shed have severe disease. It is rainy in spring and summer, especially in the rainy years during the rainy season.
Governance method:
1. Control the humidity of the seedbed and increase the ventilation to dry the bed after occurrence.
2. Disinfect the seedbed. once the central diseased plant is found, it should be treated with pesticides in time.
3. Chemical control: use copper preparations, cyanefazazole, ethicin, etc. for control.