Codonopsis is one of the main Chinese herbal medicines planted in the high mountains of northwestern Hubei Province. Purple feather disease (commonly known as “rust rotâ€) is the most serious and most harmful codonopsis disease occurring in the area. The disease is harmful to the roots of the Codonopsis, and the light causes the root bar of Codonopsis to be thin and rust-brown: severe causes dry rot or necrosis of the whole root bark, seriously affecting the quality and yield of Dangshen. According to the survey, there are plots of purple feather disease. Codonopsis pilosula lighter production by 10% to 20%, reduced by 20% to 30%, severe reduction in production, the reduction rate of more than 50%. 1 The main symptoms. Purple feather disease can occur throughout the growing season of Codonopsis. At the time of onset, purple-red (or reddish-brown) silky mycelial cords were seen on the epidermis of the roots of Codonopsis pilosula, accompanied by a velveteen-like mycelium membrane. As the disease progresses, mycelial and hyphae gradually spread, covering part of the entire root system and extending from the epidermis to the root. After the roots of Codonopsis pilosula were destroyed, symptoms usually began to appear on the aboveground part of the ground in mid-June. First, plant growth gradually stagnated, and then the upper part of the leaves began to wither and die from the bottom up. August is the peak period of onset, and the condition can continue until October. In severely affected lands, the top part of the Codonopsis pilosula is often flake-shaped, the onset is very obvious, and the diseased plants are easy to pull up. When codonopsis was dug in the fall, it was seen that the surface of the infected Codonopsis root was partially or completely covered with velvet-like “red rustâ€, and its quality was significantly reduced. In severe cases, the meaty part was almost completely destroyed, and the entire root bar was dry or rot-like and completely lost its use value. 2 the incidence of law. The mycelium, mycorrhizal or sclerotia are overwintering in the soil with the diseased roots and can survive in the soil for many years. Diseases are mainly transmitted through soil, seedlings, and unrefined fertilizers. The disease is most serious in heavily populated land, followed by the occurrence of ripe lands where crops have been planted, and the occurrence of uncultivated land in newly cultivated lands is the lightest. In addition, the incidence of heavy rainfall, high humidity in the year is heavier, on the contrary, the incidence is lighter; sticky heavy buildup is more severe. On the contrary, the incidence is lighter: the seedlings cultivated in the heavily populated or rehabilitated areas are more severe after planting, and the seedlings cultivated in the uncultivated land are less likely to be affected after planting. 3 prevention measures. 1 insist on rotation. This is the most economical and effective measure to prevent the occurrence of purple speckles in Codonopsis. If conditions are available, it is best to choose the newly planted wasteland to grow Codonopsis. Secondly, it is possible to plant gramineous crops for many years and have not cultivated codonopsis pilosula. Since the land suitable for planting Codonopsis in the alpine area is limited, it is necessary to plant the Codonopsis pilosula in the cultivated land of Codonopsis pilosula. The interval between the former and the latter should be 3 to 4 years. 2 Select disease-free seeds and seedlings. It is advisable to plant seeds on the two-year-old, robust and disease-free Codonopsis plants planted in uncultivated land, and to select newly reclaimed raw land or rehearsal seedlings planted for many years. Normally only chemical fertilizers are used in nursery areas, and no farmyard fertilizers are applied to prevent the purple feather disease bacteria from being brought into the nursery ground. 3 Do a good job of seed and seed disinfection. Before the seed and seed of the Codonopsis pilosula are sown or transplanted, the use of carbendazim, thiophanate-methyl, or other fungicides for the soaking and spray-disinfection treatment can reduce the damage of purple feather disease to some extent. 4 Deep plowing before winter and soil treatment before planting. Before the winter, the plot will be planted in the following year for cultivation of Codonopsis, and some of the germs will be eliminated through freezing and thawing in winter. Codonopsis pilosula is used in combination with soil fertigation before transplanting, and 100 kg of quick lime is applied per mu to change the physical and chemical properties of the soil, or to disinfect the soil with chlorinated nitrobenzene. This can reduce the incidence of purple feather disease. spread. 5 Apply rotten organic fertilizer. With ring fertilizer and soil fertilizer as the base fertilizer, it must be piled up and matured in advance, killing the bacteria through high temperature can be applied to the field. The soil dregs collected from forests may also contain the purple feather pathogen. If you do base dung, you must use high-temperature smoke and nausea (in mountainous areas, you should use “fire manureâ€) to use it. In addition, controlling nitrogen application, increasing potassium fertilizer, formula fertilizing, promoting the development of root system of Codonopsis lanceolata, and robust growth can enhance its resistance to diseases and reduce disease occurrence. 6 Use mulch anti-double weight products. Before the transplanting of the dangshen seedlings, the roots were sprayed with an antibiological agent (NEB) (the seedlings were lined up and diluted with E.cobalt and then sprayed to the roots to completely moisten with a sprayer). Then - transplant again in Daejeon. This method can effectively promote the proliferation of beneficial microbial communities in the rhizosphere of Radix Codonopsis, improve the microecological environment of Codonopsis, reduce the infection of pathogens, and significantly improve the resistance to disease and disease prevention of Codonopsis, whether in heavy or non-repeated land masses. All have significant effect of increasing production. 7 removal of diseased plants, chemical control. In the early stage of disease, combined with the agricultural operation, the abnormal diseased plants were removed in a timely manner and the lime powder was disinfected. During the rainy season, intensify the drainage of the gutters, and apply bactericides such as carbendazim, mancozeb, and transplanting herbs to the plants around the disease center to irrigate the roots. At the same time, all fungicides such as thiophanate-methyl must be protected and effective. Control purple feather disease damage. fold mask machine Dongguan Huitong Automatic Machinery Technology Co., Ltd , https://www.medicalmaskmachines.com