The picture of broccoli black rot and the control method are bacterial diseases caused by Xanthomonas. In addition to harming broccoli, it also harms cruciferous vegetables such as cabbage, cabbage and radish. In recent years, the black rot of cauliflower has been increasing year by year, which has seriously affected the yield and quality of broccoli.
Symptoms After the plant is infected by the pathogen, the leaves begin to develop from the leaf margin, and the "V" shaped yellow-brown lesions spread from the apex of the veins inward and on both sides. The veins are necrotic and black, and the disease is dry and brittle when the air is dry. When the diseased part of the tissue is rotted, the vascular bundles of the stems and roots are blackened.
Black rot comprehensive prevention measures
- Seedbed disinfection: Formalin can be selected with formalin. The method is: use 30 to 40 ml of formalin per square meter of seedbed for 2.5 to 5 kg of water, then spray with a sprayer (to the nozzle), while spraying and tumbling, spraying After evenly covering the agricultural film, the film is uncovered one week later, and the soil is turned several times to allow the formalin to evaporate completely for about 5 to 7 days.
- Seed treatment: soaking with 50% dexamethasone 200 times solution for 15 minutes, then washing and drying to sow. Soaking seeds with warm soup will seriously affect the germination rate of broccoli, so it should be used with caution and not used as much as possible.
- Seedbed management: If it is in the summer, it is necessary to use protective land to raise seedlings and cover the sunshade net to prevent sun exposure and torrential rain. After the seedlings are unearthed, the seedlings should be checked frequently to ensure that the seedlings are strong and strong. Pull out and spray medicine, and control pests such as blight, stagnation, and cabbage caterpillar during the whole seedling period.
- Rotation of the crop: the rotation of non-cruciferous vegetables for more than 2 years can basically solve the problem of soil bacteria. In order to eliminate or reduce the pathogenic bacteria in the soil, the grounding is carried out for 10 to 20 days before planting to accelerate the maturation of the plant residues and the death of the bacteria in the soil.
- Fertilizer management, cultivating and weeding: seedlings planting, slow seedlings, to apply enough seedlings, plant fertilizers should be topdressed 2 to 3 times during the growth period to prevent premature senescence of plants and enhance their disease resistance. Irrigation should not be flooded with large water to reduce the chance of spread of germs. According to the sensation, timely cultivating and weeding.
- Insect control and pest control: In addition to direct damage, the pests also provide pathogens for infection from wounds. Therefore, the plots with many pests and black rots are also heavy. To prevent disease, it is necessary to treat the insects first, especially the harm of cabbage caterpillars and diamondback moths. .
- Prevention and treatment of diseases: After the occurrence of black rot disease central disease in the field, it should be promptly prevented. 50% of the control agent can be used, 50 times of the ammonium, 500 mg of agricultural streptomycin, streptomycin sulfate, neomycin, etc. It has obvious control effect, and the other 50% methyl thiophanate and 50% carbendazim WP have good control effect.
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