Interpretation of the essence of controlling soft rot of lettuce

Lettuce fleshy stem infected with soft rot: primary water immersion spots, dark green irregular, then brown, rapid softening rot. Infection of the rhizome: the base of the rhizome becomes light brown, softens and rotten gradually, and can go deep into the root pulp or in the ball when the condition is serious.

Control measures: 1. Reasonable crop rotation should be carried out with Gramineae crops for 2-3 years in seriously diseased fields in order to reduce the residual bacteria in the soil and reduce the probability of damage to plants. 2. Scientific management, during the growth period of lettuce, reasonable watering and topdressing, more rotten organic fertilizer, combined with spraying vegetable strong stem spirit should be applied to activate plant ecological growth positive energy, enhance plant water absorption and fertilizer absorption, and promote lettuce rhizome rapid expansion and development, high yield and high quality. 3. In field tillage management, wounds should be avoided as far as possible, and diseased plants should be pulled out and taken out of the field in time to be buried or burned, which can greatly reduce the infection source of soft rot in the field. Flooding should be strictly prohibited when watering, and watering should be controlled during the epidemic period of the disease. 4. timely quarantine the occurrence of diseases, timely spraying targeted pesticides in the early stage of lettuce soft rot, combined with the mixed use of new high lipid film can transform high toxic pesticides into poisoning, poisoned pesticides to low toxic pesticides, low toxic pesticides to slightly toxic pesticides, control the volatilization of pesticides, prevent the erosion of little Rain Water, reduce the dosage per mu by half, improve the control effect by many times, and stop using drugs 3 days before harvest.