1. Use disease-free seeds. Planting seeds from disease-free plants. Can also use more than 2 years of Chen species, there is a certain effect of disease prevention. 2, seed disinfection. If new seeds less than one year old are used, they must be sterilized by seed soaking in warm water of 48-49°C for 30 minutes. When soaking, they must be constantly stirred. After soaking, they should be put into cold water to cool down, and then they should be sown by drying or germination. After soaking, the germination rate is reduced by about 10%. 3, eliminate field sickness. The sickness takes 2-3 years of rotation. The diseased leaves were removed early in the disease. Field sickness should be concentrated or deep buried. 4, pharmaceutical control. When the celery seedlings are 2-3 cm high, they should be sprayed and sprayed once every 7-10 days. The agent can be used: 75 chlorothalonil wettable powder 500-800 times, 65% zeocin WP 500 times; 50% dexamethasone 1000 times; 1: 0.5: 200 Bordeaux mixture. 5, to strengthen the cultivation and management of improved cultivation techniques can effectively control the occurrence and harm of the disease. (1) Sow the seeds and escape the disease period. The traditional method of sowing in spring, the method of harvesting leaves in stages, changed to the method of harvesting in stages to avoid the disease period. Such as early celery in March nursery, planting in mid-April, harvest in early June; two celery vines in mid-April, sowing in early July; harvested celery before sowing, harvested in September. In this way, in the epidemic period of spot blight in July and August, early celery and two-celery celery have already been harvested, and the low-volume celery seedlings are conducive to avoiding hazards through field management. (2) Select cultivation to control temperature and humidity. According to the characteristics of celery, “Hey Wenliang is afraid of extreme heat, and he is moist and afraid of droughtâ€, he chooses black soil to grow celery and uses a small amount of water for three days to control the temperature and humidity in the field and reduce the damage of spot blight, and obtain 13,000 kilograms per mu. The high yield. (3) See Miao catching water. On the basis of applying basal fertilization, early celery is low in temperature due to cool days, continuously pouring 3-4 times of rinsing water, and the seedling is about one foot high and then watered; the second celery is mainly chased with ammonium sulfate, and the manure is secondary; Celery and autumn celery are top-dressed with ammonium sulfate and water. In the event of vulcanization, sun exposure or improper management, it is prone to spot blight, timely discharge of rainwater from the field, irrigation of water, and more use of ammonium sulfate instead of manure. (4) Proper close planting and time seedlings. Planting too dense or inseminated seedlings is not timely, often resulting in poor ventilation, high humidity between plants, and easy incidence. Density of 10-15 cm spacing, 10-15 cm from the hole, 6-10 per hole is appropriate.
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