Symptoms: this disease is easy to occur in spring and autumn. It is easy to occur when the temperature is 15 ℃. It mainly damages the position of the stem base. When the temperature is high, the stem will appear light brown spots. When it is serious, it will turn gray white, and the later part is easy to rot.
Prevention and control: take preventive measures, planting density shall not be too dense, and daily water and fertilizer management shall be strengthened. Once the sick plant is found, it needs to be pulled out immediately. When the disease is serious, it needs to be treated by spraying medicine in time, which can spray to the lower part of the plant.
Symptoms: if infected with this disease, the leaves of the plant will slowly distort, and then the symptoms of atrophy will eventually lead to partial necrosis of the veins.
Prevention and control: strengthen water and fertilizer management at ordinary times, pay attention to ventilation in time, and strengthen light conditions. Pay more attention to observation at ordinary times. Once there is any sign of infection, the diseased plant should be pulled out immediately and then destroyed together.
Symptoms: after infection with the disease, irregular spots will appear on the surface of the leaves. The color is light gray green to light red, which will eventually lead to the death of the leaves.
Prevention and control: in addition to pulling out the disease strains in time, we also need to use drugs, such as appropriate Bordeaux spray.