Comprehensive Prevention and Control Techniques of Cucumber Root Rot
Symptoms: During the adult plant stage, water-soaked, slightly sunken lesions appear on the stem near the ground and gradually rot. The main lateral roots become completely rotten and die. The disease is root-based and does not spread upward.
Control Methods:
1. Seed Disinfection: Use seeds from disease-free plants or soak them in 50°C warm water for 20 minutes to reduce the risk of infection before planting.
2. Seedbed Disinfection: Prepare a seedbed using disease-free soil. Alternatively, water the soil with a 50% Daisen ammonium solution diluted 200–400 times to prevent pathogen buildup.
3. Soil Improvement: Apply no-tillage soil conditioners to enhance soil structure, drainage, and microbial activity, which can help suppress disease development.
4. Early Disease Prevention: In the early stages of infection, apply a 65% dexamethasone solution diluted 500–600 times. Spray the affected area once every 5–7 days for 2–3 applications to control the spread of the disease effectively.
Additional Tips: It’s important to maintain good field hygiene by removing infected plants promptly and avoiding overwatering, as excess moisture can promote fungal growth. Crop rotation with non-host plants is also recommended to break the disease cycle and improve long-term soil health.
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