There are powdery mildew, brown spot, and rust on the aerial parts of Astragalus membranaceus, and on the ground, there are blight, purple feather disease, white feather disease, and root rot. Among them, powdery mildew, rust, and purple feather disease are common and most serious.
Powdery mildew: mainly damage the leaves, but also infect the petioles, stems and capsules. The disease starts from May to June every year, and the incidence rate can reach 100% from September to October.
Prevention and control methods, completely remove the diseased body, pay attention to the ventilation and light transmission between the plants, and use the new planting land to avoid continuous planting with leguminous plants and planting on low-lying wet land. Fertilizers should be dominated by farmyard fertilizers, and the proportions of fertilizer N, P and K should be reasonably matched. Pre-disease or early onset of drug treatment should be carried out. Can be used 62.25% Xiansheng 600 times, 25% Trifenin 800 times, 70% thiophanate-methyl 800 times or 50% carbendazim 600 times spray, can also be sprayed wave US 0.3 degrees lime sulfur. 7 to 10 days spraying 1, even spray 3 to 4 times.
Rust: The main damage leaves. June to July is the peak period. High planting density in the field, too much nitrogen fertilizer, and high humidity and rainfall are favorable for disease.
The prevention and control methods are selected from well-drained, sunny slopes and sandy soils with deep sandy soil. Thoroughly clean up the field sickness and reduce the number of bacterial sources for overwintering. In the early stage of onset, 25% triadimefon 600 to 800 times, 62.25% cents 600 times, 80% mancozeb 600 to 800 times, or sprayed with diuretic sodium.
Purple feather disease: mainly damage the roots of plants more than 1 year old. The onset of the disease started from a small root and gradually spread to the main root. The symptoms were most pronounced from August to September.
As a control method, the purple-blade pathogen can survive for many years in the soil, and its host range is wide and it is not easy to eradicate. Prevention and control are mainly to strengthen the cultivation and management, soil disinfection. Lime 100 kg per 667 square meters to neutralize the acidity of the soil, the disease prevention effect is good. The diseased plants were immediately cleared and destroyed. Use 70% thiophanate-methyl 1000-fold, 50% benzene-based 1000-2000-fold solution or carbendazim and other drugs. Diseased soil can be treated with lime nitrogen (20-25 kg/667 m2), but it must be plowed into the soil early (2 weeks before) to decompose the active ingredient cyanide into urea before planting.
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