Symptoms: This is one of the insect pests that often occur in wanglian. It began to appear in late July, and it was the most serious period in late August. The larva will bite the edge of the leaf, which will affect the aesthetic degree and cause problems in the growth.
Prevention and control: during the period of insect damage, it needs to be treated by spraying medicine in time. It can spray trichlorfon or kill enemy, which can have a good effect.
Symptoms: it is easy to occur from the beginning of June to the end of August. It is a strong period of harm around the end of June, mainly the part of leaves. Most of them will attach to the back of the leaves, nibbling on the flesh of the leaves, resulting in cavities of different sizes.
Prevention and control: you can remove it manually, trap some watermelon skin, or feed a herring for swallowing. Before planting, first dry the water, then spray carbofuran powder to kill.
Symptoms: from August to October, nymphs and adults will gather on the leaf surface and the edge of the leaf and lie on it to suck juice, which will affect the growth of the plant.
Control: it can be sprayed with chemicals, such as Myzus pine or yutengjing.
