The celery spot blotch is also known as the blight and leaf blight. It is common in all parts of China and the place of protection is also serious. It is the main disease of celery.
1, symptoms
There are two types of the disease: the first type is the first disease of the old leaves, and then the new leaves. The lesions on the leaves are scattered and vary in size. Initially a pale brown oily small spot, enlarged after the middle of the brown, began to be necrotic, the outer edge is mostly reddish brown and obvious, a small amount of black spots scattered in the middle. Most of these types are large spots, and the diameter of the lesion is as large as 3 to 10 mm. The second type is difficult to distinguish from the first type, but the late stage is yellow-white or gray-white, with obvious edges, yellow-brown, and many black small spots. There is usually a yellow halo outside the lesion. The lesions vary in diameter but are small and generally rarely exceed 3 mm. The petiole and stem are infected, the diseased spot is slightly oblong in the brown oblong, and the black spot is scattered in the middle.
2, the disease conditions
The disease is a fungal disease. It is easy to occur under cold and high humidity conditions. When the temperature is 20 to 25 ° C and the humidity is high, it is easy to develop. In addition, even when it is rainy or dry during the day, there is fog or dew at night, and the temperature is too high or too low, the plant resistance is weak and easy to develop. The disease can occur from the seedling stage to the harvest stage, and the early stage is lighter.
3. Prevention measures
Seed treatment
Cultivate the strong seedlings, soak them in warm water at 48 °C for 30 minutes before sowing, and stir them constantly to make the seeds evenly heated. After taking them out, they are placed in cold water to cool down, dried and then sown. During the daytime, the room temperature is maintained at about 25 °C, and at night it is not lower than 10 °C. As the seedlings grow, the ventilation volume is gradually increased, and the seedlings are planted early to make the seedlings grow vigorously. 75% of the chlorothalonil WP can be sprayed about 600 times before the planting. liquid.
Reasonable use of plant growth regulator celery to slow seedling to the middle of growth, 50mL green wind 95 water 15kg evenly sprayed 2 times, 8 days apart, 1 month before harvest, foliar spray 50mg / kg gibberellin, The effect of increasing production is significant.
Chemical control
At the beginning of the disease, 45% chlorothalonil aerosol can be used for fumigation, 3000~3700g per hectare or 64% antivirus 矾500 times solution, 50% dexamethasone 1000 times solution, 30% DT bactericide 400 times solution, 58% toxic Mold and manganese zinc 500 times solution. The above-mentioned agents can be used alternately, once every 7 to 10 days, and even sprayed 2 to 3 times.
Strengthen field management
The celery needs more water, and should be combined with the actual situation, and the water should be poured. It was found that the central diseased plants were removed in time and the medicine was sprayed around. The pesticides and regulators were stopped 10 to 15 days before harvest to ensure pollution-free production. After harvesting, the leaves were removed from the field and buried deep to reduce the source of the disease.
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