Control of lettuce rot

The disease is mostly infected from the petiole or root of the rhizome, and it is initially water-stained yellowish brown soft rot with a foul smell. Sometimes soft rot begins at the edge of the outer leaf or at the top of the bulb, and in severe cases the root pith and bulb rot. Germs spread through watering or insects, invading from the wounds and cracks of the plant. The optimum temperature for disease occurrence was 25 ℃ ~ 30 ℃. Prevention and control methods: prevent flood irrigation and stagnant water in the border, pay attention to ventilation and dehumidification, remove diseased plants in time, and properly control watering. At the initial stage of the disease, 72% of neophytomycin wettable powder or agricultural streptomycin sulfate wettable powder 4000-5000 times liquid, or 50%DT wettable powder 500x liquid, or 47% plus Ruinong wettable powder 500x liquid, or 77% soluble micronized powder solution. It is generally sprayed once every 7 to 10 days, for 2 times in a row.