How to prevent and cure the bacterial soft rot of ginseng?

How to prevent and cure the bacterial soft rot of ginseng? Please introduce the symptoms of bacterial soft rot of ginseng: mainly harmful to the roots. The disease spot is brown soft rot, the edge is clear, round to irregular shape, different size, constant combination, and finally lead to the whole ginseng root soft rot. Squeeze the disease spot with the hand, there is a white bacterial pus overflow, with a strong irritating smell. When the disease is serious, the whole ginseng root tissue decays and disintegrates. At the initial stage of the aboveground part of the plant, the edge of the leaf turned yellow and curled up slightly, and irregular brown or red spots appeared on the leaf. In severe cases, the whole leaves showed purplish red, and finally the leaves wilted. Wilting developed from recoverability to non-recoverability. The pathogen of ginseng bacterial soft rot is two kinds of bacteria: (1) Pseudomonas caryophyllus Pseudomonas caryophylli Starr et Burkholder, which belongs to Pseudomonas aeruginosa. The cell was rod-shaped, without capsule, polar flagellum and negative for Gram staining. (2) the variety Erwinia carotovoravar of carrot soft rot. Carotovora Bya., belongs to Euclidean bacteria. The mycelium was short rod-shaped, with weekly flagella and negative Gram staining. Incidence regularity of ginseng bacterial soft rot: ginseng soft rot bacteria are abundant in soil, and soil is the overwintering place and primary infection source of soft rot bacteria. Bacteria invade ginseng root mainly through wound. When the ginseng root has strong growth and strong disease resistance, the pathogen is in a latent state. All parts of ginseng root can become the latent place of soft rot bacteria, especially the spore carrying rate is the highest. When the growth of ginseng root is weak, the disease resistance is reduced, or the external temperature and humidity conditions are suitable, the ginseng root appears soft rot symptoms. In the later stage of the disease, it is often co-infected with Fusarium, Rhizoctonia and other fungi, and the mycelium of fungi appear on the outside of the lesion. Prevention and control measures of bacterial soft rot of ginseng: (1) planting ginseng in high and dry land to prevent soil consolidation and stagnant water; do not use seed planting with wound to prevent ginseng root injury when transplanting. (2) strengthen cultivation and management, protect against cold in time in winter, and pay attention to the control of underground pests in order to reduce wounds. (3) soil disinfection: 20% copper acetate wettable powder 50 g / curtain mixed, 80% allicin EC 1000 × 2000 times spray, 50% chlorobromoisocyanuric acid water soluble powder 1000 times, etc. Click to get more ginseng planting technology click to get more medicinal material planting technology