Prevention and control of diseases, insect pests and weeds in cabbage vegetables at seedling stage

Cabbage vegetables such as cauliflower and cabbage are in the seedling stage in autumn, when diseases, insect pests and weeds occur seriously in high-temperature and rainy weather, so measures should be taken as soon as possible. Diseases: the main diseases in seedling stage are black rot, downy mildew and so on. The method of soaking seeds in warm soup and mixing medicine is often adopted to treat the seeds, that is, the seeds are soaked in 50 ℃ warm water for 10 minutes, and then mixed with 50% thiram or 75% chlorothalonil of 0.4% seed weight. Fields with serious downy mildew at seedling stage can be sprayed with 58% metalaxyl mancozeb 600 times solution. Pests: the main pests that harm cabbage vegetables at seedling stage are beet armyworm, Spodoptera litura, grasshopper and so on. Where there are conditions, insect prevention nets can be used to cover and raise seedlings to prevent pests from entering the harm. When pests are found, spray 2-3 times with high (8% fluoridinourea high fluorine EC) 1500 times or 10% except 2000 times. Use the starting medicine 1-2 days before transplanting. Grass damage: soil treatment before seedling after sowing is an important measure to effectively control grass damage at seedling stage. Generally, after sowing and covering the soil, use 20% diachlor 150-200 ml per mu, or 33% field supplement 60-80 ml, or 96% Jindu 40-50 ml, add 50 kg of water spray to control.