MySheen

Licorice brown spot of medicinal plant

Published: 2024-11-25 Author: mysheen
Last Updated: 2024/11/25, The scientific name of licorice is GlycyrrhizauralensisFisch. Alias beautiful grass, dense grass, belongs to leguminous perennial herbs. It is used in medicine with root and rhizome. It has the effect of harmonizing the emergency, moistening the lungs and detoxifying, and reconciling all kinds of medicines. Produced in Inner Mongolia, Gansu, Shanxi, Shaanxi, Liaoning, Jilin, Heilongjiang, Hebei and other provinces. The main symptoms are damage to leaves. The disease spot on the leaf is round or irregular, the size is l-3mm, the center is grayish brown, the edge is brown, and there are grayish black mildew on both sides, that is, pathogen conidia.

The scientific name of licorice is GlycyrrhizauralensisFisch. Alias beautiful grass, dense grass, belongs to leguminous perennial herbs. It is used in medicine with root and rhizome. It has the effect of harmonizing the emergency, moistening the lungs and detoxifying, and reconciling all kinds of medicines. Produced in Inner Mongolia, Gansu, Shanxi, Shaanxi, Liaoning, Jilin, Heilongjiang, Hebei and other provinces.

The main symptoms are damage to leaves. The disease spot on the leaf is round or irregular, the size is l-3mm, the center is grayish brown, the edge is brown, and there are gray-black mildew on both sides, that is, pathogen conidiophores and conidia.

The pathogen CercosporaastragalisWoronichinFisch is called Cercospora astragali, which belongs to semi-known subphylum fungi. The fruiting body is born on both sides of the leaf, and the leaf surface is mostly. The constellation consists of a small number of brown cells. Conidiophores 6 Mel 12 fascicles, light brown, unbranched, with 0-5 geniculate nodes, apex subtruncate, spore scar obvious, with septum l-7, size 24 Mel 71 × 4Mue 5.5 (μ m); conidia flagellate, colorless, with 10 septum, 3280 × 3MAE 4.5 (μ m). The strain also harms Astragalus membranaceus and Ziyun pod.

The route of transmission and the condition of the disease overwintered by mycelium on the remnant. When the conditions are suitable in the next spring, conidia are produced and the initial infection is carried out by means of wind and rain transmission. After that, the disease department produced spores for re-infection. Inner Mongolia, Liaoning, Heilongjiang and other provinces occurred from July to August, with more autumn rain and serious dew.

Prevention and control methods (1) clear the garden in autumn, deal with the disease and residue in time, and reduce the source of primary infection. (2) spraying 70% mancozeb wettable powder 500 times at the initial stage of the disease.

 
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