First, the symptoms of disease
The top of the celery can be infected. The leaves were infected and the water spots began to fade into green, round, and small spots. They gradually developed and enlarged nearly round or irregular shaped large lesions. The edges of the diseased areas were not obvious and the center was gray-brown. After the lesions are linked to each other, the dead leaves die. When the humidity is high, the disease minister has a gray moldy layer. The petiole became oblong or streaked, water stained, gray-brown, depression, petiole often fractured from the diseased part, and the diseased part had gray mold.
Second, the incidence of the law
The pathogens may overwinter on the celery in the protected area with the mycelium attached to the seed or the sick. When conditions are appropriate, conidia are produced and transmitted through rainwater, air currents, agricultural tools, and agricultural activities. The optimum temperature for germs development is 25-30°C, and the optimum temperature for conidial germination and infection is 28°C. High temperature, rainy weather, closed climate, and high humidity environment are all favorable and popular. The occurrence of celery cultivation with high density, large temperature difference between day and night, long dew condensation time, high management temperature, lack of fertilizer, lack of water or irrigation, and weak growth is more severe.
Third, control methods
(a) Agricultural control
(1) Cultivate strong seedlings: To regulate the temperature and humidity of the seedbed, separate the seedlings when the seedling grows to two leaves and guard against seedlings. Spraying “Aoli-Ke-Shuangbeier†500 times at the seedling stage can prevent disease at the seedling stage;
(2) Rotation of Rotation: Tomatoes should be subject to a three year rotation system with non-solanum crops;
(3) Strengthen field management: High-ridge cultivation, reasonable fertilization, timely ridge-sealing after planting and replanting, and promotion of new roots occur. In the greenhouse, it is necessary to control the temperature and humidity and strengthen the management of ventilation and light transmission. In the result period, the lower diseased leaves should be regularly removed, buried deeply or burned so as to reduce the chance of disease transmission;
(II) Chemical control
Preventive medications:
In the expected onset, the use of "Aoli - Ke - Cream Bell" 500 times spray or cream Bell 30ml + 40ml Jinbei 40 kg, once every 7-10 days.
Treatment medication:
1. In the early stage of disease, timely removal of diseased leaves, diseased fruit and severe diseased branches, and then according to the disease situation of the crop during this period, the use of cream bell 50ml + gold shell 40ml or cream bell 50ml + mildew only 30ml or cream bell 50ml + Qingke rick 30ml, 15 kg of water, 5-7 days of medication, once every 2-3 times.
2. When the disease is severe, remove central diseased plants, diseased leaves, etc., and timely adopt integrated Chinese and Western medicine prevention and control methods.
Such as: Cream Bell 50ml + cyanide? Frostozole 25g or inosine Wei? Hydrochloride 20g, 3 days of medication 1, once every 2-3 times, can be effectively treated.
(1) soaking in warm soup. Soak the seeds in warm water at 48°C for 30 minutes, remove and soak in cold water for 15 minutes.
(2) Strengthen management. Shading and cooling can effectively prevent the occurrence of the disease. Strengthening fertilizer and water management, releasing air and reducing humidity, doing a good job in field sanitation, and removing sick bodies can suppress their occurrence.
(3) Chemical control. At the beginning of the disease, 5% chlorothalonil dust or 5% mothionine dust can be used for 1 kg spray per 667 square meters; 10% chlorothalonil smoke smoke; 50% carbendazim 500 times or 40% sulfur glue Suspension 800 times or 70% Thiophanate 600 times spray.
Fourth, pay attention to the problem
1. Control the watering appropriately at the beginning of the disease, and pay attention to enhanced ventilation to reduce the air humidity.
2. Cultivate disease-free strong seedlings, increase organic base fertilizers, and pay attention to reasonable combinations of nitrogen, phosphorus, and potassium fertilizers.
3. After the harvest, remove the diseased leaves completely.
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