The black heart rot of the cabbage is mainly harmful to the leaves. The pathogen is a bacterium, which is called the wild rapeseed yellow single cell rod-shaped bacteria wild rapeseed black rot pathogenic type. Seedlings and adult plants can be infected, which is characterized by vascular bundle necrosis and blackening. The seedlings that were unearthed from the seedlings were water-stained and soon died. After the death, the adult disease began to produce "V" disease spots on the leaf edge. The posterior leaf expands, the pathogenic part turns yellow, and some pathogens expand along the veins, causing polygonal brown spots on the leaves, and the vascular bundles in the roots become black and rot. But as long as the prevention is timely, it can reduce losses. The following small series will share the prevention and control measures of black heart rot. Conditions of communication: In the growing season, it spreads mainly through diseased plants, fertilizers, wind and rain, or agricultural tools. It is generally used in continuous cropping with cruciferous vegetables, or in hot and rainy weather and high-humidity conditions. Leaf surface condensation and leaf edge spitting water are conducive to the onset of pathogen invasion. In addition, improper management of fertilizer and water, plants grow long or premature aging, the host is in the stage of illness, and pests or storms are frequently affected. Prevention: 1. Pay attention to the selection of resistant varieties. 2. Rotate with non-cruciferous vegetables for 2 to 3 years. 3, seed disinfection before sowing 45% Dysonium water solution 300 times solution soaked for 20 minutes, washed with water and dried for sowing; or seeded with 50% DT, DTM wettable powder with a seed weight of 0.4%, or soaked with 20% quinoflake 1000 times 20 minutes, washed with water to dry and sow; or soaked with 77% of the suspending agent 800 ~ 1000 times the solution for 20 minutes, washed with water to dry and sow). Special attention should be paid to the fact that cabbage seeds should not be soaked with streptomycin or neophytamycin to avoid phytotoxicity. 4. Strengthen cultivation management. Sowing at the right time, not suitable for sowing too early, reasonable watering, suitable seedlings; pay attention to reduce the wound; clean the garden in time after harvest. 5, timely spraying prevention and control  can spray 20% quinoflazer wettable powder 1000 times solution, or 45% dasen ammonium water agent 1000 times solution, or 77% can kill suspension agent 800 times solution, or 50% DT or DTM can be wet Powder 1000 times liquid, 2 to 3 times, once every 7 to 10 days, alternately applied, spray evenly. More pesticide knowledge , please pay attention to China Pesticide Network
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Control measures for black heart rot