Symptoms: this disease mainly occurs in wet seasons. For example, it is very common in summer. There will be black spots on the leaves. In the later stage, more and more spots will appear, eventually forming a black and yellow patch.
Prevention and control: to prevent this disease, first of all, we should strengthen ventilation, air circulation, and spray multi fungus agent for prevention and control. If there are dead leaves and diseased leaves, they should be cut off and burned.
Symptom: it is mainly caused by strong sunlight. After the disease, the leaves will turn yellow in a large area, and even dry out.
Prevention and control: shade the plant itself, block the strong sunlight, and cut off the yellow leaves.
Symptom: the disease will cause yellow leaves and fester. The reason is that the pathogen invades the wound and the new leaves cannot grow out.
Prevention and control: usually pay attention to the amount of water, in order to prevent, after the discovery of the disease, cut off this part, but also apply carbendazim on the wound for sterilization and disinfection.
Symptoms: the insects attach to the leaves and then suck the juice.
Prevention and control: usually can't be in sultry heat, pay attention to good ventilation. If it is found, it can be removed by hand or small brush first, and spray after a large number.
