Symptoms: the disease is caused by fungal infection. It first attacks the edge of the leaves, and then gradually develops to the middle part of the leaves. In the later stage, the whole plant will die. The disease starts in the middle and late May, and enters the peak period in July and August, mainly because of the high temperature and humidity of the weather, which will help the spread of the disease.
Prevention and control: prune the branches frequently, remove the over dense branches, and then keep the light and ventilation between the plants, so as to play a preventive role. If the disease is found, spray chlorothalonil or carbendazim every 10 days, 3-4 times in a row.
Symptom: the larva is mainly harmful to the branches, causing the growth of the damaged branches to weaken, and even causing the branches to die.
Prevention and control: from the middle of May, use purple light lamp to trap and kill adults, and in the first ten days of July, find feces, and dip the cotton ball with phoxim, which can be removed.
Symptoms: this pest will seriously damage the plant, causing problems in the growth state.
Prevention and control: in the peak period of egg formation, spray 400 times of 95% jiefenling emulsion, which will have a good effect.
