The serious disease of chrysanthemum is chrysanthemum leaf spot disease. The disease occurs from the lower leaves of the plant and the diseased spots on the leaves are scattered. At the beginning, it was a faded green spot, and it turned brown or black. The lesions gradually expanded into round, oval, or irregular shapes. Diameter of 2 mm to 10 mm, gradually expanded, spread from the bottom of the plant upwards. In severe cases, the lesions are united into pieces, the leaves are drooping and hang upside down on the stems, affecting the whole plant. The diseased bacterium is wintered by a conidial device on a diseased plant in a diseased plant or soil, and is transmitted by wind and rain, and the stomata invades. April to October each year is the onset period, especially in the high-temperature and wet season from May to August. Therefore, management should be strengthened in peacetime. When watering, avoid spraying and wetting the lower leaves. Do not plant too dense and increase ventilation. Once the diseased leaf is found, it must be removed and destroyed in time, and sprayed with 53% Jin Lei Duomier WP 600-800 times, or 75% Dakkoning (chlorothalonil) WP 500 times, or 65% zeocin Wettable powder 500 times, or 10% Bordeaux mixture is sprayed every 7 days to 10 days. 3 to 4 consecutive times to control the condition, or spray 50% thiophanate 1000 times before the onset of the disease, or 50% carbendazim 500 times have good control effect. China Agricultural Network Editor
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