Lotus black spot disease is an infectious disease that occurs in all cultivated lands of lotus plants. Planting and potting plants will be infringed upon. This disease can also harm water lilies such as water lilies and lotus flowers. The symptoms, occurrence rules and control methods of the disease are described as follows: First, the onset of symptoms in the early stages of the leaves have a round of macular, then gradually expanded to irregular dark brown lesions, uneven distribution of lesions, but the general veins are not infringed. There is a yellow halo in the outer circle of the lesion, irregular ring patterns on the plaque, and a significant black mold layer. 2. /P> Second, the occurrence of regular pathogens to mycelium in the diseased plant residues overwintering, the onset of disease in late May, 6 to September for the peak period of disease, high temperature and humidity and dense ventilation environment can make the disease worse. Third, control methods After the spring bud, spraying 70% mancozeb WP 500 times for prevention. The diseased leaves will be cut off in time to block the source of infection. Timely kill aphids, scale insects and other sucking pests. If there is an occurrence of 70% chlorothalonil wettable granules 800 times and 70% thiophanate-methyl wettable granules 1000 times alternate spraying, each interval of 8 to 10 days.
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