Symptoms: at first, there are small black spots on the leaves, and then they will gradually expand. When the disease spots form a large black brown, they will continue to spread to the whole leaves. It is better to cause the leaves to wither, lack of water, until the leaves fall, it will also harm the new buds, resulting in the whole plant to die.
Prevention and control: first, strengthen ventilation management, promote the normal circulation of air, control the surrounding air humidity, and then spray relevant chemicals.
Symptoms: this disease is mainly caused by infection, which will cause the root part to rot, not only affect the ornamental value, but also cause death in serious cases.
Prevention and control: it can be sterilized by spraying 500 times of nitrobenzene powder solution. If there is no radical cure at one time, it can be continued several times.
Symptoms: when the water is too much or the ventilation is not good, the disease is most serious. The infected position will appear brown spots, and finally form black brown spots with white bacteria on them.
Prevention and control: pay attention to ventilation and light transmission at ordinary times, remove the basin soil with bacteria after the disease, and then sprinkle lime for disinfection.
Symptom: the scale insect is one of the main pests that harm orchid, it will make the leaves fall down.
Prevention and control: first, remove the insects, and then spray 1000 times the solution of Omethoate.
