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Black spots on celery leaves are cause
It is likely to belong to the celery spot blight disease (also known as celery late blight), in addition to the prevention of celery late blight disease-free seeds, do a good job in seed disinfection, in the management of fertilizer and water should also be fully applied mature compost To prevent partial application of chemical nitrogen fertilizer, the implementation of fine water furrow irrigation, not water and water temperature irrigation, appropriate spraying of plant growth hormone and foliar fertilizer, in order to increase plant disease resistance, with the ventilation and humidity of the greenhouse and night insulation Management, and to eliminate diseased leaves, reduce field bacteria. When the field first sees disease, it is necessary to pay close attention to spraying medicine, such as spraying chlorothalonil WP or polysulfide suspension, spraying once every 7-10, and spraying 2-3 times.