Carnations are also known as carnations, carnations, and perennial herbs. Originating in Europe and America, since the introduction of the species, because of its color and beauty, the color is rich, so often do greenhouse cultivation for fresh cut flowers production. It can also be cultivated in flower beds, which is very popular with people. However, carnation is very susceptible to leaf spot disease, affecting its growth and development, and reducing the yield and quality of fresh cut flowers. Based on years of observations and prevention tests, the authors summarized the occurrence rules and control methods of Carnation leaf spot disease as follows: Symptoms and Occurrence Patterns of Carnation Leaf Spot Disease: Carnations and Mycorrhizal Sclerotinia Overwintering in the body, can survive in the soil for about a year. When the temperature rises and leaves are moist for a long time, the bacteria can grow quickly. The optimum temperature for mycelial growth is 25--30°C (26°C optimal). Molecular spores germinate at 18--27°C (24°C optimal) and spread through air currents and water, from stomata, wounds, or directly. Invasion, incubation period 10--60 days. Therefore, the incidence of greenhouse cultivation can be anniversary, open field cultivation can be disease in April-November. The disease occurs on leaves and stems and sometimes on flowers. When the disease occurs on the leaves, the lesions are light greenish watery and round spots, and gradually expand into a nearly round, oval, or long stripe, becoming a purple-brown, and the lesions gradually wither in the center. Become pale. The entire blade twists and hangs upside down on the stem. When the disease dips into the stem, it mostly occurs at the fork of the branch and the wound from the bud. The lesions are long, gray-brown, and when severe, the lesions cut the stems to make the upper leaves dead. When the disease is infected with flowers, it often causes damage on the pedicel and sepals. When the lesions on the sepals are long, the flowers cannot be opened or deformed. Control measures 1. Select a robust and disease-free cutting, remove the diseased body, keep the surface of the plant as dry as possible, and implement rotation for more than 2 years in a place with good ventilation and light transmission. Greenhouses should be well ventilated and it is important to ventilate before dusk. 2. Because the anniversary of this disease can occur, it is necessary to spray once a week a preventive fungicide, such as mancozeb, zesonzinc, promethine, chlorothalonil, etc., especially in the timely spraying after cutting flowers, with 75% Chlorothalonil, 50% Cacodine 500 times or 1% Bordeaux mixture can be used.
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