Brassica oleracea is a fungal virus (commonly known as the big root). Its pathogen, B. oleracea, is not only harmful to rape, but also invades cabbage, radish, cabbage and other cruciferous vegetables. In recent years, the occurrence of clubroot disease has seriously affected the production of cruciferous vegetables. The measures for the control of clubroot are as follows:
Prevention:
1. Select resistant varieties and cultivate disease-free strong seedlings. Planting disease-resistant varieties is the most effective measure for controlling clubroot disease.
2. Selection of seedbeds. Ventilation should be chosen so that the soil is loose and the cruciferous crops have not been planted in the past two years.
3. Control root canal disease by adjusting soil pH. In combination with 100-150 kilograms of lime in acid soil, the soil is spread evenly on the soil surface and organic fertilizer is applied. About 1,000 kilograms of mature farmyard manure is applied in Mushi, and appropriate turfgrass is added to mix the soil with soil.
4. Implement rotation. Due to the strong stress resistance of the resting spores, the severely affected rapeseed field is subject to rotation for 4 to 5 years. Do not grow rapeseed and cruciferous vegetables during the rotation year. The light-onset plots can be turned into wheat for one year to reduce the incidence.
5. Choose sunny planting. Production practice has shown that 1-2 weeks after planting is sunny, can greatly reduce the incidence.
6. Discover the diseased plants and remove them in time. Remove the diseased plants and bring them out of the field to burn or bury them in a unified manner. Do not throw them at the side of the field or in the drains. Lime around the sickle to prevent the spread of germs.
7. Reasonable irrigation and drainage. Exclude the water in the field in time, reduce soil moisture and reduce the incidence.
8. Chemical control: (1) Disinfection of seedbed: Disinfect the soil with 50% Dixon 400 times or 50% Carbendazim 300 times. (2) Seedling control. The true leaf development period of rapeseed is a critical period for prevention and control. Spray 70% Chlorothalonil 600 to 800 times or pour the whole seedbed. (3) When transplanting, use 90% root swelling or 80% root swelling 1000 times liquid to root 1 time; 10-15 days after planting, choose 3% quick lime root 1 time, each pond 300 times each time - 500 ml. (4) After the onset of transplanting, use 75% chlorothalonil WP 800 times solution or 75% dexamethasone soluble powder 500-1000 times to root, 0.4-0.5 liters per plant.
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