Scientific prevention and control of pests and diseases is also a link that cannot be ignored in Brussels sprout production. The diseases and insect pests that are prone to Brussels sprouts include black rot, black spot, sclerotinia, viral diseases, aphids, cabbage caterpillars, etc. Among them, black rot is the most common. Sclerotinia and Sclerotinia sclerotiorum are the most serious.

• black rot

The disease mainly affects the leaves and bulbs of Brussels sprouts. When true leaves are infected, "V"-shaped lesions appear on the edges of the leaves, and there are often yellow halos on the edges. The lesions gradually expand to both sides or inside, causing the mesophyll to turn yellow or wither. When the ambient humidity is too high, the small bud bulbs gradually rot from bottom to top and turn dark brown. Pathogens are bacteria. Prevention and control methods are mainly agricultural control. Apply more phosphorus and potassium fertilizers, and provide timely ventilation and cooling. Commonly used prevention and control drugs include biological antibiotics 600-800 times solution, 20% phytazole 800-100 times solution, 2% Ningnan Lei 1500-2000 times solution, etc.

• Sclerotinia

The disease belongs to the fungus Ascomycota. In the early stages of the disease, water-soaked irregular spots appear at the base of the plant stems. In the later stage, white mycelium appears from wet rot at the base of the stem. When the disease is severe, white hyphae will form on the leaves and bud bulbs. In order to prevent and treat the disease, the diseased bodies must be removed in time and ventilation must be strengthened. 250-300 grams of 40% Subai smoke agent can be used per acre, once every 5-7 days, or 50% multi-bacteria can be sprayed on the leaves. Ling 800 times solution, add 36% trichloroisocyanuric acid 800-1000 times solution.