Symptoms: this disease mainly damages the leaves, petioles and young stems. At the beginning, there will be light green spots on the leaves. At the later stage, it will gradually become light yellow, and then it will expand into large spots. At the later stage, the back of the leaves will produce white scars.
Prevention and treatment: at the beginning of the disease, you can spray a little Bordeaux or pesticidal, once every 10-15 days.
Symptoms: it is mainly harmful to the leaves. At the beginning, there will be white spots on the leaves. When it is serious, the whole diseased leaves will fall off.
Prevention and control: prevention should be done before, and the next leaves should be swept away to reduce the possibility of disease. After the disease, the diseased leaves can be removed to prevent infection to other healthy leaves, and chlorothalonil can be sprayed at the beginning of the disease.
Symptom: This is one of the most important insect pests. It mainly invades its leaves and young stems, causing problems in plant growth, weakening growth and affecting ornamental.
Control: when aphids are found, they need to be isolated immediately, and then spray 1000 times of 10% Omethoate emulsion, or use 1000 times of dichlorvos emulsion.
