Occurrence characteristics; celery late blight is a fungal disease, the bacteria grow well in cold and humid conditions, the optimal temperature for the disease is 18 °C ~ 25 °C, humidity is above 95%, warm greenhouse humidity, celery general incidence weight. 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 First of all, in fertilizer and water management should also be fully applied mature compost, to prevent partial application of chemical nitrogen fertilizer, the implementation of ditch irrigation, do not flood irrigation, appropriate spray plant growth regulation Agents and foliar fertilizers to increase plant disease resistance. At the same time, do a good job of greenhouse ventilation and humidity management and night heat management, reduce the temperature difference between day and night, reduce plant condensation, control germs, and remove residual leaves, reduce the field bacteria source. 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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