1. Use resistant soybean varieties to reduce the risk of disease.
2. Practice crop rotation with non-host plants like corn, millet, and sweet potatoes to break the disease cycle.
3. Incorporate well-rotted farm manure along with potash and phosphate fertilizers during sowing to improve soil fertility and plant health.
4. Apply seed treatment granules at planting time to enhance root absorption and protect against root infections.
5. Before sowing, treat seeds with 35% metalaxyl powder at a rate of 0.3% of the seed weight to prevent fungal diseases.
6. Implement proper field management by performing timely deep plowing, soil cultivation, and weeding. Ensure proper drainage after rain to avoid excessive moisture, which can promote disease development.
7. Immediately remove and isolate any diseased plants, clear all debris, and disinfect the affected planting holes using lime to prevent further spread.
8. Once the disease has occurred, it becomes difficult to cure, so prevention is key. For preventive measures, you can use 40% root rot control agents, such as 70% thiophanate-methyl wettable powder diluted 400 times, or 58% wettable powder diluted 600 times. You can also use 50% carbendazim WP at 500 times dilution. Other options include 75% chlorothalonil wettable powder diluted 600 times, 77% mancozeb wettable powder at 600 times, or 64% antivirus WP diluted 900 times. Mix any of these fungicides with 600 times diluted amino acid-based liquid fertilizers like Soybean Health Spleen or San Tian Qing. Add 500 times diluted fulvic acid solution and 1000 times diluted rooting powder. Spray the base of the plant every 7 days for 2–3 applications, alternating between different products. For better results, you can also apply the mixture directly to the roots through irrigation.
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