Rapeseed white rust, also known as cruciferous white rust, is a host of cruciferous crops such as cabbage, mustard and radish.
Symptoms of damage: White rust mainly damages the leaves. Initially it was raised white flecks on the back of the leaves. The lesions were round to irregular and most could be joined together. The initial surface of the freckle is smooth and breaks after ripening, emitting a white powder that is the sporangia of the pathogen. In the front of the leaf blade, no ecchymoses (white powdery spots are produced on the front of the leaves, and there are no powdery spots on the back of the leaves), but the formation of maculae with indistinct edges, and the late disease stage gradually withered. Sometimes a layer of black mold is produced, which is caused by saprophytic bacteria. In addition to the leaves, the germs can also invade the pedicels and floral organs of the seedlings, causing pedicels, bending, enlargement, and malformation of the flowers.
Pathogens and disease conditions: The disease is caused by flagellin, subphylum white rust, and other low-level fungi. The pathogenic bacteria overwinter on the retained plant or diseased body of the mycelia, but it is also possible for the oospore to overwinter in the soil with the diseased body. In places where solar greenhouses are produced, there are hosts throughout the year, and pathogens can overwinter and re-infect greenhouse vegetables. Sporangia can germinate at 0～25°C, hi humidity and lower temperature, and occur at high latitude, high altitude and low temperature and rainy conditions. In addition, the diseases are heavy under continuous cropping, partial nitrogen fertilization, excessive plant density, uneven terrain, excessive watering, and poor drainage.
Prevention and control measures: The prevention and control of this disease should adopt comprehensive prevention and treatment measures based on agricultural control. 1. At present, there are no disease-resistant varieties in China. In severe areas, rotations should be taken every year with cruciferous crops. 2. Remove diseased bodies in a timely manner and bring them out of the field for centralized destruction, reducing the source of overwintering bacteria. 3. The irrigation of cruciferous crops should be groundwater shallow irrigation. In greenhouse planting, special attention should be paid to humidity and reasonable fertilization to prevent partial nitrogen fertilizer application. 4. Chemical control. The following agents can be used at the early stage of disease: 69% Anke Manganese Zinc Wettable Powder 600 times, 72.2% Precloxone 600-800X, 72% Kelue (Huosu Manganese Zinc) wettable powder 600-800 times, 64% Antivirus WP 500 times, 58% Metalaxyl Manganese Zinc WP 500 times, 70% Ethyl Alumino Phosphor Manganese Zinc WP 500 times, 80% Mancozeb WP WP 600-800 times or 75 % Chlorothalonil (Dakkonin) 600 times the wettable powder, one or more of the above agents, alternate spraying, once every 7 to 10 days, 2 or 3 times in a row. The cruciferous crops have waxy layers on their leaves, and the chemicals are not easily adhered. The best solution is to add a little soft water-passing agent to improve the control effect. Spraying should focus on the back of the leaves.
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