Carnations, also known as carnations and carnations, are perennial herbaceous flowers. Since its origin in Europe and the United States, it has been popular with people because of its color and beauty. Carnations are often cultivated in greenhouses for fresh cut flowers and can also be cultivated on flower beds in open fields. However, carnations are highly susceptible to leaf spot disease, affecting their growth and development, reducing the yield and quality of fresh cut flowers, and affecting economic income.
First, the symptoms and the law of occurrence:
Leaf spot pathogens live on the soil of diseased plants with hyphae and molecular spores and survive for about one year in soil. When the temperature rises and leaves are moist for a long time, the bacteria can grow quickly. The optimum temperature for mycelium growth is 25-30°C (26°C optimal). The molecular spores start to germinate at 18-27°C (24°C optimal) and are transmitted through air currents, water, and direct invasion from wounds or wounds. The incubation period is 10-60 days. Therefore, the incidence of greenhouse cultivation can be anniversary, open field cultivation in April to November can be the disease. 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.
Second, the main 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. Since this disease anniversary can occur, it is necessary to spray once a week a preventive fungicide, such as mancozeb manganese, zesin zinc, acetaminophen, chlorothalonil, etc., especially in the timely spraying after cutting flowers, with 75% chlorothalonil, 50% cetanol 500 times or 1% Bordeaux mixture are all acceptable.
This method
First, the symptoms and the law of occurrence:
Leaf spot pathogens live on the soil of diseased plants with hyphae and molecular spores and survive for about one year in soil. When the temperature rises and leaves are moist for a long time, the bacteria can grow quickly. The optimum temperature for mycelium growth is 25-30°C (26°C optimal). The molecular spores start to germinate at 18-27°C (24°C optimal) and are transmitted through air currents, water, and direct invasion from wounds or wounds. The incubation period is 10-60 days. Therefore, the incidence of greenhouse cultivation can be anniversary, open field cultivation in April to November can be the disease. 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.
Second, the main 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. Since this disease anniversary can occur, it is necessary to spray once a week a preventive fungicide, such as mancozeb manganese, zesin zinc, acetaminophen, chlorothalonil, etc., especially in the timely spraying after cutting flowers, with 75% chlorothalonil, 50% cetanol 500 times or 1% Bordeaux mixture are all acceptable.
This method
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