Disease type blight: disease during the nursery period. The roots or roots of the seedlings turn red-brown, and when they are severe, a large number of dead seedlings occur. Leaf spot disease: It mainly damages the leaves. Yellow-green spotted spots appear on the leaves at the initial stage, followed by round spots and irregular spots. In severe cases, the leaves withered and even the whole plant lodging. Spot blotch: damage leaves, petioles, stems. From the old leaves to the first disease, after infection to the new leaves, the initial small brown spots, after the expansion of necrosis, the other lesion outside a circle of yellow. Black rot: The roots of the roots and petioles are mainly damaged, and they often occur near the ground. In severe cases, the roots and crowns rot and the outer leaves fall off, but there is no odor. Soft rot disease: It mainly damages the base of the petiole and becomes dark after the water stains. Hollow pain: mainly damage the petiole, longitudinal cracks, heart leaves turn brown. Disease control measures 1, selection of disease-resistant or disease-resistant varieties, reduce disease occurrence. 2, select the kind of clear poison, seed treatment before sowing, 48 °C warm water soaking for 30 minutes. 3, two years or more rotation. 4, nurture strong hoe, seedbed soil or nursery soil disinfection. A 1:1 mixture of pentachloronitrobenzene and thiram can be mixed and sprayed on a seedbed of 8 grams per square meter and 72% of Propionic water 400 times. 5. Potassium dihydrogen phosphate plus calcium chloride 0.1 to 0.3% at seedling stage. 6. Combination of ecological prevention and chemical prevention, pay attention to cooling and humidity control, control the temperature during the day at 18 ~ 23 °C, higher than 23 °C to release air in time, control at 13 ~ 18 °C at night, narrow the difference between day and night, reduce condensation, avoid large Flood irrigation. In the early stage of disease prevention and control, blight sprayed 15% of yammycin, 450 times of liquid, 72.2% of Pro-cress 400 times of spray, or 3% of polyoxygen, 600 times of liquid to root. Every 7 days. Leaf spot spraying can kill 77% of enemy wettable powder 500 times, or 10% of world high water dispersible granules 4000 to 5000 times, or 45% chlorothalonil smoke agent. 250 grams per acre, every 9 days, depending on the condition decides the number of applications. Leaf blotch uses 45% chlorothalonil smoke agent, 250 g/mu, or 75% chlorothalonil wettable powder 600 times, or 64% antivirus powder 500 times, or 10% Water dispersible granules from 1500 to 2000 times. Black rot spray 75% chlorothalonil wettable powder 600 times. Soft rot spraying agricultural streptomycin or neophytin 4000 times or 77% can kill 500 times the German wet powder, every 7 to 10 days 1 time, control 2 or 3 times. The drug was stopped 7 days before harvest. Hollow disease prevention celery heart can spray 05% sodium chloride solution; to prevent cracking of hollow and petiole, can be sprayed with 0.1 ~ 03% borax aqueous solution, spray 10 to 15 days 1 time, and even spray 2 to 3 times.
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