Symptoms of celery gray mold disease, the seedling stage from the roots of the seedlings, the emergence of water-like necrotic spots, the surface dense gray mold layer. The upper part of the adult plant can develop disease. Generally, it begins to develop from the leaves of the plant with dew condensation or the leaf with the wound on the lower part, the petiole, or the weak outer leaves of the yellowish leaves. The water is initially immersed and the latter disease is softened, rotted, or wilted. The disease minister has a gray moldy layer. In severe cases, the entire celery rots.
Non-pollution control technology: 1, rotation, diseased plants were found timely picking leaves. More than 2 years of rotation. Add base fertilizer to promote its robust growth and enhance resistance to disease. Watering should be in the morning. General early onset should be properly controlled watering, pouring water. Strengthen management after pouring to prevent condensation.
2. Strengthen the temperature management of the greenhouse. When the greenhouse temperature rises to 33 degrees, when the greenhouse temperature rises to 33 degrees, the air is released again. When the greenhouse temperature drops to 25 degrees or more, the air is released at noon and the temperature of the greenhouse is maintained at 20 to 25 degrees in the afternoon. . Ventilation is turned off when the temperature of the shed drops to 20 degrees to slow down the temperature of the shed. In the night, the temperature of the booth is kept at 15~17 degrees, and the ventilation openings are opened on cloudy days.
3, chemical control, with 15% of procymidone smoke agent 200 grams per mu, or 50 grams per 100 cubic meters of Tec smoke, or with 45% chlorothalonil smoke agent 250 grams per acre smoke 1 night, every 7 - Re-smoking 1 time in 8 days. Or spray 50% Pythium WP wettable powder 1000-1500 times, or mus 5% mildew dust 1 kg, or 50% get wettable powder 600 times, or 60% anti-mildew treasure ultrafine powder 600 times liquid , every 7-10 days spray 1, spray a total of 3-4 times
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