Licorice rust
Latin scientific name: Uromycesglcyrrhizaemagn.
Harmful crop: licorice
Symptoms of damage: mainly damage to leaves. After the seedlings were unearthed in spring, there were round, gray-white blister spots on the back of the leaves, and the posterior surface broke into a yellowish-brown powder pile, which were germ summer spores and summer spores. In the later stage of the disease, the leaves of the whole plant were all covered with summer spores, resulting in the death of the aboveground part of the plant, the proliferation of phloem tissue at the junction of the stem base and the root or stem, the germination of latent buds, and the dwarfing of the plant. After the re-infection of summer spores, the leaves scattered black-brown winter spores on both sides, and scattered black-brown winter spore powder. The disease is the main disease of cultivated licorice, spread all over the main producing areas of licorice, and is the main factor affecting close planting.
Taxonomic attributes: basidiomycetes subphylum, unicellular rust fungi
Distribution area: major licorice producing areas
Disease characteristics: the pathogen is a single main parasitic rust, overwintering with hyphae and winter spores on plant roots, rhizomes and aboveground withered branches, and produce summer spores in the next spring. Cultivated licorice has a high incidence of wild licorice. For example, if it was rainy last autumn and the temperature rebounded faster in the coming spring, it would be beneficial to its occurrence. In Yikezhao League, the peak occurrence of diseased plants of biennial cultivated licorice is in mid-May, the rate of diseased plants is about 10%, and the death rate of diseased plants is in late June, with a mortality rate of more than 90%. The peak period of occurrence of winter spore disease is in the middle of July.
Control method: thoroughly remove the disease and residue in the field after harvest. Select the plants that are not infected with rust and grow healthily, and cut off the aboveground stems and leaves in winter and spring water and autumn in order to reduce the occurrence of the disease. At the beginning of early spring, 20% trimethoprim was sprayed with 1500-fold solution or 97% dimethylidene sodium was sprayed 3 times.
Commonly used medicament: 20% Fenanning
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Licorice rust and its control
① pathogen Glycyrrhiza uralensis rust pathogen (Uromycesglycyrrhizae) belongs to the genus → of the subphylum basidiomycetes, →, → rust, → Puccinidae. The regularity of ② is a. In the summer spore stage, at the seedling stage of Glycyrrhiza uralensis, a light brown summer spore pile appears at the tip of the leaf that has not yet spread. With the spreading and growing of the young leaves, the spore pile appeared densely along the leaf back from the leaf tip, and finally the whole leaf back was covered by the spore pile, showing a yellow color.
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Morphological characteristics of licorice
Licorice is a perennial herb, as high as 30-80 cm, the rhizome is more horizontal. The taproot is very long and stout, with a reddish-brown skin. Stem erect, with white short hairs and spiny glands. Leaves odd-pinnate, leaflets 7-17, ovate or broadly ovate, apex acute or obtuse, base round, with short hairs and glands on both sides. Butterfly Corolla lavender. Pods flat, sickle-shaped or annular curved, outside densely spiny glands. The florescence is from June to July and the fruiting period is from July to September.
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