1. Powdery mildew: the harm of powdery mildew is great. At the beginning, it acts on the leaves. At the later stage, the pedicels, flowers and branches will also be infected. White powdery substances appear on the leaves, and mycelium will grow at the later stage, which has a great impact on the growth of the later stage. Before germination, it is necessary to spray chemicals for prevention, and after the onset of the disease, spray with chlorothalonil.
2. Black spot: this disease often occurs in summer. When it comes on, it is easy to cause fallen leaves, which will seriously affect the ornamental quality of plants, and greatly affect the beauty. You can spray Bordeaux once a week, or you can use a mixture of sulfur and stone, it will have a good effect.
1. Starscream: this pest will cause the leaves to turn yellow, and in serious cases, the leaves will fall down. Spray pyridaben every half a month in early summer, and increase the spraying frequency after insect damage.
2. Thrips: This is a very common pest. It will absorb the juice in the plant and cause the leaves to deform. After the occurrence of this pest, acetamiprid spray can be used for treatment.
3. Aphid: it is serious in spring and autumn, which will cause damage to leaves and deformation and fall. Prevention should be done before occurrence, and imidacloprid and acetamiprid can also be used after discovery.
