Round spot disease can harm all parts of the plant. Leaves on the back of the leaf appear yellow spots on the back of the leaf. In wet weather or continuous rainy days, it quickly expands into a transparent round shape. When the weather is dry after onset, the lesions are large and round brown. Obviously round pattern. When the culm is victimized, the affected part is chestnut-colored, and the diseased part has a gray and white mold layer, which can cause bud rot and stem rot.
Control methods
First, in the epidemic season of round leaf spot, open the ventilation door of Sanqi Garden to increase the air flow and reduce the humidity in the park.
The second is to adjust the light intensity of Panax pseudoginseng to avoid excessive light, which is conducive to the spread of diseases.
The third is to clear the debris in time, found that the diseased plants were promptly removed, concentrated burned or buried, while spraying 70% thiophanate-methyl WP wettable powder 600-800 times, or 600 times Antai Health.
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