In early spring, cabbage is particularly vulnerable to root rot, which can lead to large areas of seedlings drying out and dying, causing significant losses in production. In the spring of 2006, this disease had a major impact on some local vegetable farmers, resulting in heavy economic losses. To prevent such issues this year, it's crucial for farmers growing spring cabbage to focus on disease prevention from the very beginning—starting with the seedling stage.
**First, understanding the main symptoms**
Root rot typically appears shortly after the seedling stage or following transplanting. The stem’s outer layer turns brown and begins to decay, while the root system deteriorates. Affected plants are easily pulled out from the soil, showing clear signs of infection.
**Second, conditions that favor disease development**
The pathogen overwinters in both seeds and soil. In early spring, when cabbage is grown under plastic or small sheds, the combination of low temperatures and high humidity creates ideal conditions for the disease to thrive. Infected irrigation water can further spread the pathogen across fields.
**Third, effective control measures**
1. **Seed treatment**: Choose high-quality seeds and treat them with a 800-fold dilution of withered Aetna for 4 hours to disinfect. After soaking, rinse twice with clean water, drain, and then germinate before sowing. Alternatively, you can use a 1% saline solution for disinfection.
2. **Soil treatment for the seedbed**: Disinfect the seedbed soil using a 1000-fold dilution of carbendazim, or mix withered Antai at 1000 times. You can also apply matrine powder at a ratio of 1:1000 to control underground pests. Ensure the seedbed is level and about 10 cm deep. Using organic-inorganic bio-activated fertilizers as nursery fertilizer can greatly enhance the plant’s resistance to root rot.
3. **Sowing and seedling care**: Spread the germinated seeds evenly on the seedbed and cover with about 1 cm of fine sand or sandy loam. After covering, place a plastic sheet over the bed to raise the temperature and promote germination. Avoid flooding the seedlings, as excessive moisture and low temperatures can encourage various seedling diseases.
4. **Seedbed management**: Once the seedlings start to emerge, water them regularly but avoid overwatering. When 30% of the seedlings have emerged, spray a 500-fold dilution of withered wilt solution 2–3 times, spaced 7–10 days apart, to prevent damping-off, blight, and root rot. After all seedlings have emerged, apply Weisheng D1300 at a 1300-fold dilution once or twice, with an interval of 10–15 days, to promote growth and prevent disease. When the seedlings are strong enough, thin them out, leaving 2 inches between each plant. Water carefully without flooding. Before transplanting, ventilate the seedlings and allow them to harden off. The day before transplanting, water them thoroughly.
ood Grade Supplement Same Medication,Food Grade Supplement Sam Supplement,Medication Sam E
Jiangxi Chengzhi Bioengineering Co., Ltd , https://www.chengzhi-bio.com