It is likely to belong to the disease of celery spot blight (also known as celery late blight), celery late blight is a fungal disease, pathogens can overwinter on the seeds and sickness. Sick seeds are sown, which cause disease after emergence and produce conidia that spread in the nursery bed. Diseases and debris on the source of overwintering bacteria, in appropriate conditions, resulting in conidia spread by wind and rain, infestation of celery, and then produce conidia repeated infection.
1. Select and broadcast disease-free seeds and do a good job of seed disinfection;
2, 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 small-scale furrow irrigation, not water and water temperature irrigation;
3. Appropriate spraying of plant growth hormone and foliar fertilizer to increase plant resistance to disease;
4, do a good job of greenhouse ventilation and night heat insulation management, and to eliminate diseased leaves, to reduce field bacteria source;
5, when the field first saw the disease, it is necessary to pay close attention to spray control, such as spraying chlorothalonil WP or polysulfide suspension, spray every 7-10, and even spray 2-3 times.
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