Symptoms: it mainly occurs at the base of stem and rhizome. After being infected, the part close to the surface will suffer from soft rot. the disease will spread upward until it dies. It will cause soft rot of rhizome downward. The flower will turn brown and the pedicel will break.
Prevention and control: after infection, first dig out the root and stem part, then remove the infected part above, or remove the rotten part, replace the surrounding soil, and then reduce the source of infection, so as to control the occurrence of the disease.
Symptoms: it is easy to occur near flowering, generally the lower part begins to brown and wither, and the disease will continue to develop the leaves inside. The roots have shown the soft rot of water stains, and only the epidermis can be left.
Prevention and treatment: remove the above spots thoroughly, soak in warm water for one hour after drying, or soak in acetic acid solution for 10 minutes, and then plant again after drying.
Symptom: the most important pest is the breeding fly, which belongs to the maggot. The young insect will erode the young seedling part, leading to decay and death.
Prevention and control: organic fertilizer should be selected for fertilization, which can prevent the generation of insect eggs. In the period of easy to grow insects, a little powder can be sprayed to kill insects, which can greatly reduce the possibility of infection.
