How to prevent diseases and pests of potted lotus

Black spot

Symptoms

When the disease first occurs, many irregular brown spots with fine lines will appear on the leaves. As the disease progresses, many black mold-like substances will appear. Often multiple spots link together to form larger patches. When the disease is severe, the entire plant will die.

Prevention and treatment methods

Once brown spots are found, they must be cleaned up promptly and sprayed with carbendazim or thiophanate-methyl solution in time. During the growing season, spray carbendazim appropriately for prevention.

Rot

Symptoms

When the disease occurs, green spots appear on the edges of the leaves, which gradually connect into one piece and expand inward, gradually turning brown. When the lotus root rots, the center part will turn brown and gradually extend upward, and the nodes and stems will gradually become necrotic.

Prevention and treatment methods

Spray carbendazim solution in time for prevention and control. When the disease occurs, spray 3 to 5 times every 3 to 5 days. In other cases, spray once a month for prevention and control.

Spodoptera litura

Symptoms

This pest will eat the leaf flesh, leaving the veins and surface, and the leaves will appear grayish white like screen windows. When the larvae grow larger, they not only eat the leaves, but also damage the buds and flowers. June to October every year is the peak period for Spodoptera litura.

Prevention and treatment methods

You can remove diseased leaves manually. If insects are found, scrape or destroy the diseased leaves in time. In areas where larvae gather, spray 1000 times solution of methyl parathion for prevention and control.

aphid

Symptoms

Aphids have strong adaptability to the environment and are widely distributed. It mainly harms the stems and leaves of the plant, especially the young branches and buds.

Prevention and treatment methods

Aphids reproduce strongly and have been found to be difficult to eradicate. Therefore, long-term maintenance is required and regular spraying of pesticides is required for prevention and control. Use diluted DDT emulsion for spraying once a month. When the disease is serious, increase the number of spraying appropriately.