Broccoli high-quality and high-yield requires prevention and control of pests, diseases and physiological disorders

Broccoli has relatively strong disease resistance, and in normal years it rarely develops diseases. However, if planted too densely, with continuous rain and poor field drainage, diseases such as black rot, root rot and downy mildew can occur. Disease control should focus on prevention. In addition to strengthening water management, the lower diseased leaves should also be removed in the later growth stage to improve ventilation and light penetration. 15 days after transplanting, downy mildew can be prevented by spraying every 10-15 days with 72.2% propamocarb 600 times solution, or 75% chlorothalonil 500 times solution, etc., combined with New High Lipid Membrane 800 times solution. To control root rot, 72% agricultural streptomycin 3000 times solution, or 77% copper hydroxide wettable powder 1500 times solution and other agents combined with New High Lipid Membrane 500 times solution can be used alternately 2-3 times. The main pests are cabbage caterpillar, diamondback moth, aphids, tobacco cutworm, etc. To control cabbage caterpillar and diamondback moth, 2.5% spinosad 1000 times solution, or 5% fipronil 1500 times solution, or 0.3% matrine 3000 times solution, etc. can be used. Aphids can be controlled with 10% imidacloprid 2000 times solution, or 50% pirimicarb 2000-3000 times solution, etc. Tobacco cutworm can be controlled with 3% chlorfluazuron 2000-3000 times solution.