First, the root rot disease begins with fibrous roots, roots brown rot, and gradually spread to the main root, eventually leading to whole root rot, until the stems and leaves above the ground withered, the whole plant withered. The disease is often associated with the infestation of underground nematodes and root lice, and the disease is serious when the soil has heavy viscosity and there is too much water in the field. Radix Astragali, Radix Salviae Miltiorrhizae, Radix Isatidis, Radix Scutellariae, Radix Pseudostellariae, Radix Paeoniae Alba, and Codonopsis Pilosula are susceptible to the disease Prevention and control: Before sowing, use pesticides such as C-Phosphorus to spread the soil, prevent and control underground pests, and apply organic fertilizers to enhance disease resistance. In the early stage of disease, it can be irrigated with 800-1000 times of thiophanate-methyl and carbendazim, and drained in time after rain. Second, root-knot nematode disease due to the root-knot nematode parasites, in the root of medicinal herbs a lot of nodules, resulting in slow growth of plants, leaves yellow, and finally the whole plant withered. The disease is caused by Salvia miltiorrhiza, Campanulaceae, Astragalus, Ginseng and North Adenophora. The best prevention and treatment of grass crop rotation or flood and dry rotation for comprehensive control. Pharmaceutical control methods: 1, soil disinfection. Before sowing or planting, 0.3-0.5 grams of bacteria line per square meter, 3500-7500 times the amount of water or 200-500 times the wet fine soil on the screen evenly sprayed or spread on the soil surface, available conditions Plastic film covering 48-72 hours; or 5% of net per acre with 3-4 kg, mixed with fine soil into the sowing ditch or sowing hole. 2, the growth period (onset). The bacteria line Wei 3500-7000 times liquid, watering the plant base. Third, white peony disease often occurs in the roots near the ground or at the base of the stem. A layer of white silky filaments appears. When it is severe, it rots into a mess, eventually causing the leaves to wither and the whole plant to die. Frequently in the rainy season or when the soil is soiled. The disease is caused by astragalus, Campanulaceae, Atractylodes macrocephala, heterophylla, etc. Prevention and treatment should be rotated with grass crops or sterilized with carbendazim and thiophanate-methyl. Fourth, blight initially appeared brown spots at the base of the seedlings, and then expanded into lesions around the stems, where the lesions were dehydrated and shrank, causing the seedlings to die. The disease is caused by astragalus, eucommia ulmoides, ginseng, Panax pseudoginseng, Atractylodes macrocephala, Radix Glehniae, windbreak and chrysanthemum. Treatment measures: Reduce soil moisture, remove diseased plants in time, treat soil with carbendazim, etc., and spray to prevent infection of other healthy strains. 5. In the early stages of wilt disease, the lower leaves become chlorotic and then turn yellow to death. Heavy-dwelling and poorly drained clay lands are seriously ill. Herbs such as Astragalus, Campanulaceae, and Nepeta often infect the disease. Prevention measures: should be rotated with grass crops, early onset of spraying with carbendazim, thiophanate-methyl and other agents. 6. When the sclerotinia disease occurs, the base of the seedlings produces a brown water-spotted lesion. The young stem soon rots, causing the collapse of the seedlings. The dark brown particles that appear later in the disease department are sclerotia. The disease is caused by Salvia, Ginseng, Atractylodes, Pinellia, Chuanxiong, Chuanxiong, Corydalis, and peony. In addition to the rotation method, the prevention and control method also applied lime powder at the center of the disease, and the plants were sprayed with aqueous carbendazim or water solution.
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