Black rot control technology for export broccoli
1. symptom Both the seedling stage and the growing stage can occur. The disease forms a "V"-shaped yellowish-brown spot, with yellow halo around the edges and leaf spots developing inward from the leaf margin. Sometimes the veins turn black, and when the roots and stems are severe, the cortex rots and the vascular bundles turn black and dry. 2. Occurrence Black rot is a bacterial disease. High temperature and high humidity are beneficial to the disease. The growth temperature of the bacteria is 5 to 39°C, and the temperature is 25 to 30°C. Poor drainage, excessive nitrogen fertilizer, more pest wounds, frequent storms, easy to disease. 3. Control methods (1) Select resistant varieties. (2) A 2-3 year rotation with non-cruciferous vegetables. (3) Strengthen cultivation and management: Deep-turning soil, deep sorghum and sorghum, ditches in the vegetable fields, drainage in time after rain, reduce the humidity in the field as much as possible. Closely and properly planted, do a good job of fertilizer and water management, and maintain plant health. Clean up field residues in a timely manner and perform harmless treatment to reduce the initial infestation source. (4) Chemical control: At the beginning of the disease, use 30% of the gram 500 times or 80% of the necessary 600 times of spraying, every 7 to 10 days, and spray 2 or 3 times. Safety interval 20 days. KEY CUTTIN BLADES FOR DIFFERENT KEY MACHINES AFTERMARKET
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