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.