Recently, there are more rainy weather, frequent temperature fluctuations, and dew condensation, and greenhouse celery infection is more common than late blight. Failure to prevent and control in time will result in a decline in yield and quality.
Occurrence characteristics Celery late blight is a fungal disease. The pathogens grow well under cold and humid conditions. The optimum temperature for the disease is 18°C～25°C, and the humidity is above 95%. Greenhouse celery is generally more serious. The weakening of the plants is beneficial to the rapid expansion of the disease.
Prevention and control methods Agricultural control: Prevention and control of celery late blight must first strengthen the fitness cultivation, in the management of fertilizer and water should also be fully committed to the use of soil miscellaneous fertilizer, to prevent partial application of chemical nitrogen fertilizer, the implementation of fine gutter irrigation, not flood irrigation, appropriate spray Apply plant growth regulators and foliar fertilizers to increase plant disease resistance. At the same time, do a good job of greenhouse ventilation and humidity management at night and reduce the temperature difference between day and night, reduce plant condensation, control germs, and to eliminate diseased leaves and reduce field bacteria. When the field first saw the disease, it was necessary to pay close attention to spraying and prevention. Chemical control: can be used 75% chlorothalonil WP 600 times, or 64% bactericide M8 500 times the wettable liquid, or 40% polysulfide suspension 500 times spray, generally 50-75 kg per acre spray volume , The above-mentioned agent is optional, sprayed every 7 to 10 times, and sprayed 2 to 3 times.
Occurrence characteristics Celery late blight is a fungal disease. The pathogens grow well under cold and humid conditions. The optimum temperature for the disease is 18°C～25°C, and the humidity is above 95%. Greenhouse celery is generally more serious. The weakening of the plants is beneficial to the rapid expansion of the disease.
Prevention and control methods Agricultural control: Prevention and control of celery late blight must first strengthen the fitness cultivation, in the management of fertilizer and water should also be fully committed to the use of soil miscellaneous fertilizer, to prevent partial application of chemical nitrogen fertilizer, the implementation of fine gutter irrigation, not flood irrigation, appropriate spray Apply plant growth regulators and foliar fertilizers to increase plant disease resistance. At the same time, do a good job of greenhouse ventilation and humidity management at night and reduce the temperature difference between day and night, reduce plant condensation, control germs, and to eliminate diseased leaves and reduce field bacteria. When the field first saw the disease, it was necessary to pay close attention to spraying and prevention. Chemical control: can be used 75% chlorothalonil WP 600 times, or 64% bactericide M8 500 times the wettable liquid, or 40% polysulfide suspension 500 times spray, generally 50-75 kg per acre spray volume , The above-mentioned agent is optional, sprayed every 7 to 10 times, and sprayed 2 to 3 times.
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