Sophora flavescens (scientific name: Sophora flavescens) is a plant of the genus Sophora in the Fabaceae family. It is distributed in Russia, Japan, India, Korea, and various provinces and regions across north and south mainland China, growing in areas at an altitude of 1,500 m, mostly on hillsides, sandy land, grassy slopes, shrub forests, and
Sophora flavescens (scientific name: Sophora flavescens) is a plant of the genus Sophora in the Fabaceae family. It is distributed in Russia, Japan, India, Korea, and various provinces and regions across north and south mainland China, growing in areas at an altitude of 1,500 m, mostly on hillsides, sandy land, grassy slopes, shrub forests, and near fields. It has not yet been introduced and cultivated artificially. Functions and indications: clears heat and dries dampness, kills parasites, promotes diuresis. Used for heat dysentery, bloody stool, jaundice with urinary retention, red and white vaginal discharge, genital swelling and itching, eczema, damp sores, skin itching, scabies and leprosy; externally for trichomonal vaginitis. Morphological characteristics of Sophora flavescens Sophora flavescens is a deciduous semi-shrub, 1.5-3 m tall. The root is cylindrical, with a yellowish-white outer bark. The stem is erect, much branched, with longitudinal grooves; young branches are sparsely hairy, later becoming hairless. Odd-pinnate compound leaves, 20-25 cm long, alternate; leaflets 15-29, leaf blades lanceolate to linear-lanceolate, 3-4 cm long, 1.2-2 cm wide, apex acuminate, base rounded, with short petiolules, entire margins, densely appressed-pubescent on the underside; stipules linear. Racemes terminal, 15-20 cm long, pubescent, bracts linear; calyx campanulate, flattened, 6-7 mm long, 5-lobed; corolla papilionaceous, pale yellowish-white; standard petal spatulate, wing petals without auricles, equal in length to the keel petals; stamens 10, filaments free; ovary stalk pubescent, stigma round. Legume linear, with a long beak at the apex, indehiscent at maturity, 5-8 cm long. Slightly constricted between seeds, appearing as an indistinct moniliform shape, sparsely covered with short soft hairs. Seeds 3-7, nearly spherical, black. Flowering period June-July, fruiting period July-September. Root rot of Sophora flavescens severely affects the planting benefits of Sophora flavescens, so what are the symptoms of root rot in Sophora flavescens and how is it controlled? What is root rot? Root rot is caused by root decay, in which the function of absorbing water and nutrients gradually weakens, and finally the whole plant dies. The main manifestation is yellowing and wilting of the leaves of the whole plant. It generally occurs from late March to early April, and enters the peak incidence period in May. Root rot of Sophora flavescens Damage symptoms: Root rot of Sophora flavescens occurs in hot and rainy seasons and damages the roots of the plant. At the initial stage, only a few roots or part of the underground rhizome are affected first, gradually spreading to the entire root system. After the roots are damaged, wet rot occurs, and the outer bark turns black. In the early stage above ground, some branches and leaves die, and in severe cases the whole plant dies. It occurs to varying degrees in all Sophora flavescens production areas, causing certain losses. Control methods for root rot of Sophora flavescens
1. Practice crop rotation: Because the soil carries the pathogen, continuous cropping of Sophora flavescens leads to early onset, severe disease, and rapid spread. It is best to rotate with gramineous crops for 3-5 years to reduce the pathogen base and lower the incidence rate.
2. Healthy seed selection: Choose disease-resistant varieties; choose robust, disease-free seed roots; do not save seeds in diseased fields, so as to reduce disease.
3. Strengthen field management: Fertilize reasonably, apply more organic fertilizer, and increase phosphate and potassium fertilizer; drain accumulated water promptly during the rainy season, pay attention to loosening the soil, and improve the disease resistance of the plants.
4. Chemical control: Per mu, mix 1 kg of 70% dexon wettable powder or 50% carbendazim wettable powder with 3 kg of fine soil, and scatter it into the holes when sowing, which has a certain control effect; disinfect cuttings and rhizome heads by soaking them in 800-fold dilution of 50% thiram wettable powder or 1000-fold dilution of 70% thiophanate-methyl wettable powder for 3-5 minutes, then air-dry before planting; apply pesticide during the growing period. In the early stage of Sophora flavescens disease onset, pour fungicide around the roots of diseased plants to control the spread of the disease. Commonly used pesticides include 500-800-fold dilution of 50% hymexazol wettable powder or 50% dexon wettable powder, or 1000-fold dilution of 96% copper sulfate, or 100-150-fold dilution of 3% agricultural antibiotic 120 aqueous solution, applying once every 10-15 days for 3-4 consecutive times.