What are the management measures for vegetables after flooding?

1. Clean out ditches promptly and drain the standing water from the fields. For greenhouse vegetables in areas with extensive and deep standing water, use pumps to drain the water, lowering the water level to below the top of the beds, reducing the depth of standing water as much as possible and shortening the duration of waterlogging.

2. After the roots of solanaceous vegetables such as chili peppers, tomatoes and eggplants are waterlogged, diseases easily spread, greatly affecting later yields, so the key is to prevent the water from being too deep and standing too long. Cucurbit vegetables such as bitter melon, cucumber and pumpkin are somewhat more tolerant of flooding, but they must not be submerged for more than 24 hours, otherwise diseases will spread and cause yield reductions.

3. Harvest waterlogged vegetables promptly. It is currently the harvest period for greenhouse vegetables, so waterlogged vegetables should be harvested in batches and brought to market in a timely manner, with diseased leaves, old leaves and diseased fruits removed promptly, and plants pruned, to reduce nutrient consumption by the plants, strengthen ventilation, enhance resistance and reduce the occurrence of diseases.

4. Focus on post-disaster disease prevention and control. After vegetables are waterlogged, field humidity is high and the disease resistance of the plants declines, making large-scale disease outbreaks very likely, so once the rain stops and the standing water is drained from the fields, carry out prevention and control work promptly.

1. After the rain stops, cover the greenhouse film properly to reduce direct strong sunlight, and spray foliar fertilizers such as potassium dihydrogen phosphate or Aiduoshou on the leaves, and apply biological bacterial fertilizer to the roots to supplement plant nutrition and enhance disease resistance.

2. Chili peppers, eggplants and tomatoes: focus on controlling late blight and bacterial wilt. For late blight, spray 58% metalaxyl (Ridomil) wettable powder at 600 times, or 64% Sandofan wettable powder at 500 times. For bacterial wilt, spray 72% agricultural streptomycin sulfate at 4000 times, or 77% Kocide wettable powder at 500 times. Apply once every week, for 2-3 consecutive applications.

3. Cucurbit vegetables such as bitter melon and cucumber: focus on controlling powdery mildew and downy mildew. Apply once every week, for 2-3 consecutive applications.

4. Leafy vegetables: harvest waterlogged plots in batches and bring to market promptly, and spray pesticides such as chlorothalonil and carbendazim 1-2 times to prevent disease.

5. Do a good job of reseeding. After harvesting severely waterlogged plots, prepare the soil promptly and reseed vegetables such as Chinese cabbage, Tetrastigma hemsleyanum, autumn bitter melon, amaranth, cowpea and cucumber in a timely manner.