1. Symptoms: the disease is a fungal disease. In the early stage of infection, there will be light brown spots on the leaves. Then the small spot gradually expanded into a 1-5mm-diameter lesion. In the later stage, the disease spots connected with each other, which eventually resulted in the death of leaves.
2. Control method: in summer, more water should be poured on the plants, and the diseased old leaves should be removed in time. In the early stage of the disease, Bordeaux solution, chlorothalonil or potassium permanganate can be sprayed for control. Spray once every 10 days to ensure the therapeutic effect.
1. Symptoms: in the early stage of the disease, small yellow or red spots appear on the leaves of the plants. In the later stage, the lesion gradually expanded and became brown or reddish brown. In severe cases, the whole branch will die.
2. Control methods: prune the branches and leaves of diseases and pests in time in autumn and winter. When a new leaf is produced, it needs to be sprayed with 27% high lipid film 150 times liquid immediately. During the onset of the disease, it can be treated with spray paint. Spray once a week, 2-3 times continuously.
1. Symptom: it often occurs under the condition of balcony planting and maintenance, and poor ventilation and light transmittance. The adults and nymphs of the scale insects live in the leaves all their lives, causing the leaves to turn yellow, the branches to wither and the tree to decline.
2. Prevention and control method: in the early stage of the disease, white wine can be mixed with water, the proportion is 1:2, and the basin soil surface can be poured thoroughly. Once every 15 days or so, 4-5 times continuously. At the same time, the injured leaves should be wiped with alcohol to kill pests.
