In recent days, we have seen several successive heavy rains here. Many of the rains have flown into the lotus ponds. Within a week after the rain, the leaves of the lotus leaf appeared yellow and rot. This rot started from the young leaves, and later the bigger leaves were also infected. In addition, other plants in the pond, such as reeds, poplars, etc., also exhibited foliar edges. What is this disease? How to solve it?
According to the phenomenon described by this reader, her lotus should have spotted blight or leaf blight. The etiology is caused by fungal, bacterial, or mold infestation.
In northern China, continuous heavy rains from June to September can often lead to the spread of various fungi. If the lotus in the conservation process is lack of fertility and weak plant growth, it will be susceptible to bacterial diseases. According to the number of lotus plants grown, we can use the method of removing diseased leaves and spray sterilization to prevent and cure.
The nursery with small production area and no severe disease can manually remove diseased leaves (floating leaves and vertical leaves are all picked) to strengthen the management of fertilizer and water and control the condition of the disease; nurseries with large planting volume and serious diseases need to be planted locally. The department purchases bactericides and removes the affected floating leaves. The available pharmaceuticals include 25% wettable carbendazim or zinc zearaphane, 50% thiophanate-methyl 800-fold solution, and 0.1% detergent powder when used; when the area is particularly large, use 1 carbendazim or thiophanate-methyl 50% solution. 10 lime powders were diluted with water and sprayed. Spraying must be done in the morning or evening. Do not spray at noon, spray once every 15 to 20 days, and spray 2 or 3 times. In addition, we must pay attention to the management of fertilizer and water to promote the growth of plants.
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