How to prevent and control lettuce soft rot? A full explanation of the key points

Infection of the fleshy stem of lettuce by soft rot: initially water-soaked spots, dark green and irregular, later turning brown and rapidly softening and rotting. Infection at the root crown: the base of the root crown turns light brown and gradually softens and rots; in severe cases it can extend deep into the root pith or into the head.

Control measures: 1. Reasonable crop rotation. For severely affected fields, rotate with gramineous crops for 2-3 years to reduce residual pathogens in the soil and lower the chance of harm to plants. 2. Scientific management. During the lettuce growing period, water and topdress reasonably, apply more decomposed organic fertilizer, and combine with spraying Vegetable Strong Stem Spirit to activate the positive energy of plant ecological growth, enhance the plant's water and fertilizer uptake capacity, and promote rapid expansion and development of the lettuce root crown for high yield and quality. 3. During field cultivation and management, try to avoid creating wounds. When diseased plants are found, pull them out promptly and carry them out of the field in a centralized manner for deep burial or burning, which can greatly reduce the sources of soft rot infection in the field. When watering, strictly prohibit flooding irrigation; during periods when the disease is prevalent, watering should be controlled. 4. Timely quarantine the occurrence of the disease. In the early stage of lettuce soft rot damage, promptly spray targeted agents for control. Mixed use with New High Lipid Film can transform highly toxic pesticides into moderately toxic ones, moderately toxic pesticides into low-toxicity ones, and low-toxicity pesticides into slightly toxic ones, control pesticide volatilization and drift, prevent washing away by light rain, reduce the dosage per mu by half, and increase the control effect many times over. Stop applying the pesticide 3 days before harvest.