Symptom: this kind of insect propagates very quickly. In late May, the damage is the most serious. They will cluster on the buds and suck the juice inside. The damaged leaves will roll inward, resulting in shrinkage deformity, affecting the growth of the strip, the excrement will also pollute the leaf surface, and the ornamental value will be reduced.
Prevention and control: usually pay attention to reasonable fertilization and apply less nitrogen to ensure that the plant can grow healthily. When it is serious, it can be controlled by insecticides, such as aphids, Pirimicarb, dichlorvos, etc.
Symptoms: it is mainly harmful to the leaves, flowers, stems and other parts, and pricks and sucks the sap in the plant. In the early stage of harm, there will be a large number of tawny shops on the front of the leaves, and in the later stage, the leaves will gradually lose green, resulting in a large number of yellowing and falling off, and in serious cases, a large number of falling leaves.
Prevention and control: strengthen daily management, reasonably cut branches, enhance ventilation and transparency, and timely water in case of drought. After the onset of the disease, it is necessary to spray triclosan.
Symptoms: adults and nymphs will suck the sap in the leaves, and the damaged leaves will appear yellow and white spots, which will gradually expand, leading to the loss of green leaves, and the most serious damage in July September.
Prevention and control: in autumn and winter, it is necessary to clean up dead branches and leaves, and then burn them to destroy adults. Spray 20% cicada powder in time during hatching period, and spray 4.5% cypermethrin 1500 times in case of large amount of occurrence.
