Celery leaf rot has gray mold layer How to control celery gray mold

Botrytis cinerea of celery often occurs from the rhizome of celery seedlings in the seedling stage, showing water-immersed necrotic spots and dense gray mold layer. In the adult stage, the aboveground parts will also occur, generally starting from the dewy heart leaves or lower cut leaves, petioles or withered, yellow and weak outer leaves of celery plants, which are water-immersed at first, soften, rot or wilt in the later stage, and grow gray mildew layer. In severe cases, the whole celery plant rotted.

Grey mold of celery

Pollution-free prevention and control technology:

1. Crop rotation, diseased plants are found and removed in time. Rotation for more than 2 years. Increase the application of base fertilizer to promote the growth of celery and enhance disease resistance. Watering should be in the morning. In the early stage of the disease, watering should be controlled and small water should be watered properly. Strengthen management after pouring to prevent condensation.

2. The temperature of the shed is changed. On a sunny morning in the evening, the temperature in the shed rises and starts again when it rises to 33 degrees; the temperature in the shed drops to more than 25 degrees, and the air continues at noon to keep the temperature in the shed at 20-25 degrees in the afternoon. When the temperature in the shed drops to 20 degrees, turn off ventilation and slow down the temperature drop in the shed. The temperature of the shed should be kept at 15-17 degrees at night, and the vents should be opened for ventilation on cloudy days.

3. Chemical control. Celery was fumigated with 200 grams of 15% fumigant per mu, or 50 grams of fumigant per 100 cubic meters, or 250 grams of 45% chlorothalonil per mu for one night, and then smoked again every 7 minutes and 8 days. Or spray 50% Pythium wettable powder 1000 Mel 1500 times liquid, or use 1 kg 5% moldy dust per mu, or 50% benefit wettable powder 600 times liquid, or 60% Fangmaibao ultrafine powder 600 times liquid, 7 Mel 10 days spray once, a total of 3 Mel 4 times.