The first is that pathogenic bacteria can spread over winter or summer in soil and sickness, and can spread and spread with rainwater, irrigation water, agricultural machinery, soil, and organic fertilizer with bacteria. Pathogens can survive for 2-3 years in soil and directly invade seedlings under appropriate conditions.
The second is soil with more bacteria, high humidity, severe disease when young seedlings grow. The seedbed is too low, the humidity is too high, the planting is too dense, the ventilation is poor, and the lack of light is conducive to the occurrence of disease.
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