What are the pest and disease control methods for cabbage?

Cabbage, also known as head cabbage, white cabbage, and ball cabbage, is a common vegetable on the market and is widely grown, but during cabbage cultivation, pests and diseases seriously affect its growth and yield. So what pests and diseases does cabbage have? How should they be controlled? Let's find out together.

1. Black rot

It mainly harms the leaves and head. When the disease occurs at the seedling stage, the cotyledons form water-soaked lesions, which then gradually spread to the true leaves. Black spots or thin black streaks appear on the veins of the true leaves, and V-shaped lesions appear on the leaf margins. In adult plants, the disease often starts on the lower leaves, forming leaf spots or yellowing of the veins. The leaf spots expand inward from the leaf margin and enlarge and become necrotic. The pathogen spreads to the stem base and forms black netted veins, causing the plant to wilt and die.

Control methods: Before sowing, soak the seeds in warm water for half an hour, then take them out, cool them down, and sow, or sow after germination. Alternatively, 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 reasonable fertilization, and avoid applying excessive nitrogen fertilizer. When the disease occurs, spray Bordeaux mixture, chlorothalonil, or streptomycin for control, which gives good results.

2. Soft rot

It generally occurs after cabbage has headed. The stem base and the inner heart of the cabbage show water-soaked soft rot, after which the plant turns yellow and withered, the outer leaves wilt and fall off, exposing the head.

Control methods: Before planting, deeply turn the soil to 18-20 cm. Pay attention to drainage during the rainy season; flooding irrigation is not suitable, and watering is not suitable on cloudy days or at noon. Practice crop rotation with Allium crops. Remove diseased plants promptly when found, disinfect the diseased holes with lime, or 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 harms the leaves. After infecting the leaves, irregular water-soaked or oil-soaked lesions appear, 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. In the early stage of the disease, spray streptomycin, chloramphenicol, or validamycin for control, with an interval of 7-10 days each time, for 2-3 consecutive times, which gives good results.

4. Cabbage butterfly

Also known as the small white butterfly or white butterfly, its larvae are called cabbage worms. It mainly causes damage as larvae, and in severe cases it eats the leaves clean.

Control methods: When the larvae cause damage, start spraying pesticides. Commonly used agents include cypermethrin-kill emulsion and cypermethrin-malathion emulsion, which give good control results, but attention should be paid to alternating 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.