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Root diseases mainly damage the roots of crops, and the onset of symptoms is the formation of tumors with different shapes and sizes, such as the number and size of plant roots and lateral roots. At the early stage of the disease, the tumor surface was smooth, the surface was rough at the late stage, and the convex and concave surface was uneven, and the tumor was as many as several dozen. In tandem, the diseased plants are clearly short. The tops of the leaves gradually turn yellow from bottom to top, resulting in a decline in crop yield and quality. According to pathogens, seeds, rainwater, irrigation and agricultural operations are mainly used as means of transmission, and like acidic soils, the soil temperature is 70-90%, relative humidity is 70-90%, which is conducive to the reproduction of pathogens. The following control measures can be taken:
1. Select disease-resistant seed and strengthen seed quarantine.
2. Crops that have been planted for more than three years should be rotated with food crops (such as corn, broad beans) or other eggplant varieties.
3, the application of high-quality organic fertilizer, supplemented by nitrogen, phosphorus, potassium formula fertilization, and application of 1000 kg of lime per acre to adjust the soil pH.
4, 50% of carbendazim WP can be used in the pond during the transplanting period.
5. It was found that the other diseased cultivars were immediately removed, and that 70% thiophanate-methyl was used to irrigate the roots.
Control Techniques of Root Diseases of Cruciferous Vegetables
Cruciferous vegetables are edible vegetable stem and leaf organ-based vegetable species, such as cabbage, vegetables, kale, porphyra and other moss. This type of vegetable has a large amount of consumption in daily life and is one of the most widely grown vegetable varieties in the city. However, due to years of planting, combined with a short growing season with a high multiple crop index, various diseases occur, especially root diseases.