Symptoms mainly harm the leaves, stems and pods. Leaf lesions first formed a small, water-soaked spot on the leaves at 1 mm, initially dark green, and then turned dark black to dark brown. The middle spots of the lesions were bright and shiny, and some of the lesions spread along the veins. The lesions often fuse into irregular necrosis and large spots. Severe veins turn brown and leaves turn yellow and distorted or distorted. Stem and infestations produce dark brown irregular striped spots. Depressed brown rash shaped spots on pods.
Pathogen Pseudomonas syringae pv. maculicola (Mccul10ch) Young et al. Pseudomonas syringae spot lesions (cruciferous vegetable P. aeruginosa), a bacterium. Bacterial rod or chain, no spores, with 1-5 polar flagellum, size 1.5-2.50.8-0.9 (μm), Gram-negative, aerobic. The colonies were smooth and glossy on the gravy agar plane, white to off-white, rounded at the edges and wrinkled at the end. There is no pellicle in the broth culture. Blue-green fluorescence was generated on KB medium. The bacteria development temperature 25-27 °C, the highest 29-30 °C, the lowest 0 °C, lethal temperature 48-49 °C for 10 minutes, suitable pH 6.1-8.8, the optimum pH7.
Transmission routes and pathogenic conditions The pathogens mainly live on the seeds or on the soil and the diseased bodies. They can survive in the soil for more than one year and can infect at any time. After the rain, they are susceptible to disease.
Control methods (1) Selection of varieties resistant to soft rot. (2) Rotate with non-cruciferous vegetables for more than 2 years. After harvesting, remove the diseased matter and concentrate deeply or burn it. (3) Establish a disease-free seeding field. Seeds with seed can be sown with 0.4% seed weight of 50% ceric acid copper (DT) wettable powder or Fengling 50-100g mixed rape seed 150g. (4) A small number of diseased plants were found to be removed in a timely manner, spraying 30% of green detergent suspension 500 times or 72% of agricultural streptomycin sulfate soluble fraction 3500 times, 47% of Garnett's wettable powder 900 times in the initial stage of disease. , 77% can kill WP 600 times, 14% ammonia bath solution 350 times, 12% green milk emulsion 600 times. For every 667m? 2 spraying good liquid 40-50L. Rapeseed is sensitive to copper agents and must strictly control the dosage so as to avoid phytotoxicity.
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