Diseases and pests of globe amaranth and their control methods

Globe amaranth leaf spot

symptom

When the disease occurs, nearly circular spots will appear on the leaves of the plant, with a diameter ranging from 2 to 7 mm. They are grayish white or grayish brown, with darker edges and a purple-brown halo. Irregular gray-brown spots may also appear on the leaf tips or edges. The spots gradually expand and the leaves may crack and fall off.

Prevention and treatment methods

Remove spotted leaves immediately to avoid infecting other plants.

Apply more phosphorus and potassium fertilizers, control the content of nitrogen fertilizers, and enhance the disease resistance of plants.

Spray pesticides in time to control the disease in the early stage of the disease. You can consult the flower shop about spraying pesticides. Commonly used pesticides such as Huahushen and Carbendazim can be used. Once every 15 days, spray 2 to 3 times continuously.

Globe amaranth damping-off disease

symptom

When the disease occurs, the stems and branches of the plant become soft and lean to one side, as if blown down by a strong wind. As the disease worsens, the stems and branches begin to rot, the leaves fall to the ground, and the plant slowly wilts and rots.

Prevention and treatment methods

In the early stage, the plant collapse is not serious and there is only slight lodging. Timely spraying of methyl thiophanate solution can alleviate the problem to a certain extent. If the stem of the plant has collapsed and started to rot, it cannot be saved unless the plant is pulled out in time. After pulling out, spray fungicides to avoid infecting other plants.

Globe amaranth virus disease

symptom

In the early stage, the main harm is to flowers and leaves. In severe cases, round necrotic spots appear, the leaves gradually turn yellow, and the flowers fall off, affecting the appearance. Viral diseases are mainly caused by infection of branches and leaves.

Prevention and treatment methods

Prevent and control diseases and insect pests, and remove insects in time once they are found.

Reduce plant wounds and avoid artificial wounds on the leaves during maintenance. Although our maintenance environment is said to be clean, it is actually full of bacteria. Prevent viruses from invading through the wounds.