Soybean root rot is caused by pathogens such as Pythium, Fusarium and Phytophthora. Bacteria overwinter in the soil or on the sick and disabled, becoming the main source of primary infection in the following year. Bacteria invade from roots or roots, spread through soil, and infect through irrigation, fertilization, wind and rain.

Cause of disease:

1, the planted tree species do not adapt to the opposite conditions and get sick: low-lying, heavy soil, poor drainage;

2. Improper management: the soil is hardened and the air permeability is not good, which leads to the difficulty of root respiration and the root system is rotted by water;

3, underground pests harm or planting wounds are not handled well, and germs invade from the wounds, causing root diseases.

Preventive and control measures:

1, improve the tree vigor, improve the ability to resist pests and diseases, and increase the application of organic fertilizer;

2. Dig deep into the soil to increase its air permeability;

3. Root irrigation treatment is carried out with root rot specific drug Senhuo root rot element;

4, soil disinfection treatment, can use soil disinfectant for soil treatment (ethylicin, streptomycin, bromobacteria.

* Pentachloronitrobenzene, etc. )

5. Spraying or root irrigation with mixed toxic soil of hymexazol, azoxystrobin and dimethomorph.