What is Astragalus powdery mildew?

What is Astragalus powdery mildew? How to prevent and cure? Symptoms of powdery mildew of Astragalus membranaceus: powdery mildew mainly harms the leaves of Astragalus membranaceus. In the early stage, there are white powdery spots on both sides of the leaves. In severe cases, the whole leaf is covered with a layer of powdery powder, and there is also powdery powder on the petiole and stem. The damaged plants often lose their leaves in the early stage and their yield is damaged. The incidence rate is generally 10%, 30%, and more than 40% seriously. Astragalus pods and stems can also be damaged. Second, the law of the disease: the bacteria produce closed cysts and survive the winter on the diseased and residual tissue. When the temperature and humidity were suitable in the second summer, the ascospores in the closed cysts rushed out of the cysts and spread widely, resulting in the first infection. The pathogen produced a large number of conidia in the disease site of the host and carried out secondary infection by air transmission. Ascospores and conidia are mainly transmitted by air. The climatic conditions of high temperature and humidity are conducive to spore germination and infection, while the dry climate is conducive to the spread of conidia. Extensive cultivation management, improper fertilization and watering, especially excessive application of nitrogen fertilizer, are easy to cause overgrowth of plants, which is conducive to the occurrence of diseases. The hyphae can overwinter on the buds of Astragalus membranaceus and cause disease the following year, causing harm until harvest. Click to get more planting techniques of Radix Astragali