Control measures against spot blight of celery

According to the survey, spot blight has occurred in some parts of the celery crops, and there are lesions on the celery leaves, petioles, and stems, which are serious. This is because the weather gradually cools after the fall and the air humidity is relatively high at night, which is suitable for disease development. The occurrence of the disease has a great impact on the yield and quality, especially after the late autumn cultivation, it should be prevented as soon as possible.
There are two symptoms of pathological diagnosis, one is the old leaf first onset, and then spread to the new leaf. The lesions on the leaves are mostly scattered, ranging in size from 3 to 10 mm in diameter, starting with light brown oily spots. After the gradual expansion, the central brown necrosis, the outer edge is mostly dark red brown, a small amount of small black spots scattered in the middle. The other is that the center of the lesion is yellow or gray in the middle of the lesion, and the edge gathers many small black particles. The lesion often has a yellow halo outside the lesion, and the lesion diameter varies. The petiole or stem was infected, the lesion was brown, the oval was slightly sunken, and the center had scattered black dots. The disease can be transmitted through seeds and sicknesses. It is prone to occur in cool and hot conditions. The temperature is 20°C~25°C and the humidity is heavy. In addition, even when it is cloudy or rainy during the day, the disease may be heavy when there is fog or dew at night and the temperature is too low and the resistance of the plants is weak.
Control methods
1, seed disinfection. Soaking with warm water at 49°C for 30 minutes, stirring while immersing and then moving into cool water, cooling, drying after sowing.
2. Strengthen field management. Apply enough base fertilizer and top-dressing to increase plant resistance to disease.
3, after the autumn delay greenhouse cultivation, pay attention to cooling and humidity. Keep 15°C~20°C during the day and 10°C~15°C during the night, reduce the temperature difference between day and night, reduce condensation, and avoid flooding.
4, pharmaceutical control. Early prevention before the onset of disease, open ground can be used 75% of Dakenin WP 600 times or 64% anti-tussive WP 500 times or 50% carbendazim WP 500 times or 50% SRK 500 times Spray, use alternately, control once every 7-10 days, prevent 2~3 times. The cultivation of greenhouses can use chlorothalonil or quick-release aerosol smoke sheds.

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