Glycyrrhiza uralensis Fisch. is a perennial herb of the family Leguminosae. Root and rhizome medicine. With and in the urgency, lungs and detoxification, to reconcile the efficacy of various drugs. Production in Inner Mongolia, Gansu, Shanxi, Shaanxi, Liaoning, Jilin, Heilongjiang, Hebei and other provinces.
Symptoms mainly affect the leaves. The lesions were round or irregular in shape on the leaves, the size l was 3 mm, the center was gray-brown, and the edges were brown. Both sides were gray-black moldy, ie pathogenic conidiophores and conidia.
The pathogen Cercospora astragalis Woroni chin Fisch is known as C. verticillata, a fungus belonging to the subphylum Fungi. The fruiting bodies are born on both sides of the leaf, with the majority of the foliage. The sub-base consists of a few brown cells. Conidia stems 6-12 root bundle, light brown, not branched, with a geniculate segment 0-5, the top nearly truncate, marked scar, with a diaphragm l-7, size 24-7l4-5. 5(μm); conidium whip, colorless, with 3-10 membranes, size 32-803-4.5 (μm). The bacteria also harmed yellow peony root and purple cloud ray.
Transmission routes and pathogenic conditions The mycelium overwinters on the body of the disease. When the conditions in late spring are suitable, conidia are produced, and the initial infection is caused by wind and rain. Afterwards, the diseased department also produced spores for reinfection. In Inner Mongolia, Liaoning, Heilongjiang and other provinces occurred in July-August, with heavy autumn rain and heavy dew.
Prevention methods (1) Clear gardens in the autumn, timely treatment of diseased bodies and reduction of primary infection sources. (2) Spray 70% mancozeb WP 500 times at the beginning of the onset.
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