Diseases and Pests of Amaranthus chinensis and Their Control

Main diseases of Amaranthus chinensis

Leaf blight

Leaf blight is a common disease among plants. It is not only common in Amaranthus avicularis, but also in other plants. The main symptoms of leaf blight are as follows. In the early stage, only small brown dots will appear on the leaves. As the plant grows, the small dots will gradually become larger and finally connected into one. In the later stage, basically the entire leaf is reddish brown, and eventually the leaves fall off and die. There are two main methods of prevention and control. One is to remove some bad leaves in winter to prevent the growth of bacteria in spring. The other is to use appropriate medication when the disease occurs, generally spraying the disease once every one to two weeks.

anthrax

Anthracnose and leaf spot are very similar, both of which harm the leaves of Amaranthus chinensis. We all know that the main ornamental value of Amaranthus chinensis lies in its leaves. If the leaves are attacked, then the Amaranthus chinensis will basically have no value. In addition, even if it is, Amaranthus chinensis is not a plant whose main ornamental point is its leaves. Once the leaves are damaged, it will be difficult to supply nutrients, which will eventually lead to the death of the plant. The method of prevention and control is to regularly trim and clean the leaves, and burn the necrotic leaves in winter every year to remove the anthracnose pathogens. This will greatly reduce the incidence of the plants in the second year. When the leaves have been infected with anthracnose, they should be sprayed with drugs.

Main pests of Amaranthus chinensis

grasshopper

Don't ignore grasshoppers just because they are insignificant. Grasshoppers mainly eat the leaves of the red holly and absorb their nutrients, causing them to wither or even die. The method of prevention and control is to detect insect eggs at the end of winter, and burn or bury the leaves with insect eggs. When grasshoppers are rampant, Dyson's new wettable powder should be sprayed to kill insects.