The Prevention and Control Techniques of Soft Rot in Sweet Potato During Seedling Stage

Symptoms: When potato chips are infected by a pathogen, the potato pieces become soft and start to rot. A layer of gray-white mold appears on the bed soil, and the soil surface may appear slightly sunken. This condition is primarily caused by cold injury or physical damage to the potato tubers during storage or in the nursery stage. The bacteria thrive in temperatures between 15°C and 23°C, making it easier for them to infect damaged potato tissues. Once inside, the tubers continue to rot, especially under cooler conditions.

Control Methods: It's crucial to carefully select healthy potato seedlings and avoid using those that have been exposed to cold temperatures or stored improperly. For seedlings that have suffered mild cold damage, the bed temperature should not be too high before they emerge. Keeping the temperature around 28°C helps promote rejuvenation of the tubers and limits pathogen growth. If the disease occurs, it's important to immediately remove all affected potatoes and contaminated soil. Then, replant with disease-free tubers and use fresh, uncontaminated soil to prevent further spread of the infection. Additionally, maintaining good sanitation practices and ensuring proper ventilation in the growing area can significantly reduce the risk of future outbreaks. Regular monitoring of the crop is also recommended to catch any signs of disease early.

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