Lotus brown leaf disease, also known as lotus black spot. Lotus cultivation areas in China often occur.
At the beginning of the onset of symptoms, chlorotic macular spots appeared on the lotus leaves, and the back of leaves was more obvious. The lesion gradually expands into irregular brown spots. When the disease is severe, the entire leaf is covered with lesions except for the veins. A lot of dark brown molds were planted on the late lesions.
The etiological agent is Alternaria palustris.
Occurrence of regular pathogens overwintered on the sick body. In the long-term production of peanuts conidia spread with the wind and rain, can repeat the dip, when the humidity is high, the disease is heavily partial nitrogen fertilizer. Summer temperatures are too high and the disease is severe in plants that are affected by mites.
Control methods
1. Completely remove diseased leaves and diseased bodies, centralize destruction, and reduce sources of infection. Potted plants can be replaced every year with new soil.
2, the onset period can be used 65% on behalf of Zinc 500 times or 75% chlorothalonil 800 times spray, can prevent the spread of disease spread.
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