Autumn celery is generally sown in July, and September and October each year is the epidemic period of celery spot blotch. Therefore, autumn celery is highly susceptible to the disease during the nursery period and causes losses. The symptoms and prevention methods of this disease are briefly introduced as follows:
First, the symptoms: celery spot blotch is also known as leaf blight. The pathogen mainly invades the leaves, followed by the petiole and stem. On the leaves, the lesions are initially pale brown oily spots. When enlarged, the outer edge of the lesion is yellowish brown, yellowish white to grayish white in the middle, and the edges are obvious. There are many black small spots on the lesions (conidia). There is usually a yellow halo outside the spot. On the petiole and stem, the lesion is oblong and slightly concave.
Second, the pathogen infection cycle and disease conditions The pathogen is a subfamily fungus, the genus A. cepacia. The pathogens mainly lie in the mycelium over the winter, and can also overwinter on the sick body. The bacteria invade the body from the stomata or directly penetrate the host epidermis. The cold and humid climatic conditions are conducive to the occurrence and prevalence of diseases. When the temperature is 20~25°C and it is rainy, the disease is serious.
Third, the prevention and treatment methods: 1, the selection of disease-free seeds: from the disease-free plants on the seeds, but also can be used for more than 2 years of breeding, there is a certain disease prevention effect. 2. Seed disinfection. If new seeds stored for less than one year are used, seed disinfection must be performed. 3. Clear the sick body in the field. The diseased area is rotated for 2 to 3 years. 4. Chemical control: When the seedling height is 2~3 cm, spray protection is started, and then spray once every 7~10 days. The medicine can be selected: 75% chlorothalonil wettable powder 500~800 times liquid; 65% daisen zinc wettable powder 500 times liquid. 45% chlorothalonil or chlorpyrifos can be used in the shed, 110 grams per mu, scatter 5~6 places, fumigation overnight, every 8~9 days. 5. Strengthen cultivation management: (1) Select cultivation and control temperature and humidity. Choose cold celery, use 3 days of small water irrigation, control the field temperature and humidity. (2) Autumn celery is treated with ammonium sulfate plus water. In the case of rain, the water in the field is discharged in time. (3) Proper close planting, and time seedlings.
First, the symptoms: celery spot blotch is also known as leaf blight. The pathogen mainly invades the leaves, followed by the petiole and stem. On the leaves, the lesions are initially pale brown oily spots. When enlarged, the outer edge of the lesion is yellowish brown, yellowish white to grayish white in the middle, and the edges are obvious. There are many black small spots on the lesions (conidia). There is usually a yellow halo outside the spot. On the petiole and stem, the lesion is oblong and slightly concave.
Second, the pathogen infection cycle and disease conditions The pathogen is a subfamily fungus, the genus A. cepacia. The pathogens mainly lie in the mycelium over the winter, and can also overwinter on the sick body. The bacteria invade the body from the stomata or directly penetrate the host epidermis. The cold and humid climatic conditions are conducive to the occurrence and prevalence of diseases. When the temperature is 20~25°C and it is rainy, the disease is serious.
Third, the prevention and treatment methods: 1, the selection of disease-free seeds: from the disease-free plants on the seeds, but also can be used for more than 2 years of breeding, there is a certain disease prevention effect. 2. Seed disinfection. If new seeds stored for less than one year are used, seed disinfection must be performed. 3. Clear the sick body in the field. The diseased area is rotated for 2 to 3 years. 4. Chemical control: When the seedling height is 2~3 cm, spray protection is started, and then spray once every 7~10 days. The medicine can be selected: 75% chlorothalonil wettable powder 500~800 times liquid; 65% daisen zinc wettable powder 500 times liquid. 45% chlorothalonil or chlorpyrifos can be used in the shed, 110 grams per mu, scatter 5~6 places, fumigation overnight, every 8~9 days. 5. Strengthen cultivation management: (1) Select cultivation and control temperature and humidity. Choose cold celery, use 3 days of small water irrigation, control the field temperature and humidity. (2) Autumn celery is treated with ammonium sulfate plus water. In the case of rain, the water in the field is discharged in time. (3) Proper close planting, and time seedlings.
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