A Detailed Guide to the Latest Pest and Disease Control Methods for Cabbage
Cabbage, also known as head cabbage, white cabbage, and packed-head cabbage, is a common sight in everyday markets and is grown over a fairly wide range. During cabbage cultivation, pests and diseases severely affect its growth and yield. So what pests and diseases affect cabbage? How should they be controlled? Let's find out together.
1. Black rot
It mainly damages the leaves and head. When the disease occurs at the seedling stage, water-soaked lesions form on the cotyledons and then gradually spread to the true leaves; black spots or fine black streaks appear on the veins of the true leaves, and V-shaped lesions appear along the leaf margins. In adult plants, the disease often starts on the lower half of the leaves, forming leaf spots or vein yellowing; the leaf spots spread inward from the leaf margin, enlarge and become necrotic, and the pathogen spreads to the base of the stem to form a black network of veins, causing the plant to wilt and die.
Control methods: Before sowing, soak the seeds in warm water for half an hour, then remove them, cool them down, and sow or sow after sprouting; or soak the seeds in a 200-fold solution of 50% amobam for 15 minutes, wash them clean, dry them, and sow. Practice reasonable crop rotation and rational fertilization, and avoid over-applying nitrogen fertilizer. When the disease occurs, spraying Bordeaux mixture, chlorothalonil, or streptomycin gives good control results.
2. Soft rot
It generally occurs after the cabbage has headed up, with water-soaked soft rot appearing at the base of the stem and in the inner heart of the cabbage; afterward the plant turns yellow and withered, the outer leaves wilt and drop off, exposing the head.
Control methods: Before transplanting, deeply turn the soil to a depth of 18-20 cm. Pay attention to drainage during the rainy season, avoid flood irrigation, and do not water on cloudy days or at noon; rotate with onion and garlic crops. Remove diseased plants promptly, disinfect the planting holes with lime, and you can also spray amobam, streptomycin, or chloramphenicol for control; when spraying, be sure to spray the leaf stalks and root crown near the ground.
3. Black spot
It mainly damages the leaves, producing irregular water-soaked or oil-soaked lesions on the leaves, which gradually turn light brown or dark brown.
Control methods: Carry out crop rotation with non-cruciferous crops for more than 2 years, disinfect the seeds before sowing, and spray streptomycin, chloramphenicol, or phytoactin at the early stage of the disease, with an interval of 7-10 days each time, for 2-3 consecutive applications, which gives good control results.
4. Cabbage white butterfly
Also known as the cabbage white, the white butterfly, whose larvae are called cabbage caterpillars. It mainly damages plants as larvae, and in severe cases it gnaws the leaves bare.
Control methods: When the larvae are causing damage, start spraying pesticides. Commonly used agents include fenvalerate-malathion emulsifiable concentrate and cypermethrin-malathion emulsifiable concentrate, which give good control results, but be careful to alternate the agents to avoid resistance.
The above is an introduction to cabbage pest and disease control methods. We hope it helps you. For more related knowledge, please stay tuned to us.