Flowers and trees are propagated in the bead, and the plant shoots are conditioned or wrapped in the soil, and new roots are generated by maternal nutrition, and then cut and planted with the mother plant to become new plants. It is characterized by promoting rooting without losing the condition of the mother plant, and has a high survival rate and easy forming; however, the operation is troublesome and the breeding capacity is small, which is mostly suitable for family flowering adoption. The bead propagation is generally divided into ordinary strips, horizontal strips, piled soil strips, and air pressure strips. It can be operated according to different types of flowers and trees. Ordinary layering is suitable for clustered flowers and trees, such as waxberry, spring, gardenia, jasmine and so on. Select the 1-2 year-old branches near the ground, first in the section by the ground at the ground with a knife to injure several roads, or ring peeling; then follow the root or basin edge ditch, deep 10-15 cm, under the branches Press it into the soil and put it in a U shape to hold it down to prevent it from rebounding. Then cover the soil and expose the branches to the outside. The main sticks are tied and do not break. This method is mostly carried out in the early spring or late autumn. The spring beading and the autumn cutoff; the autumn beading and the late spring cutting are planted. The horizontal layering strips are suitable for branches and vines and flowers, such as chrysanthemum, rose, ivy, and Ling Xiao. The branches and stems are bent on the soil surface or shallow ditch, and the soil is covered. After the roots are cut, the leaves are planted. This method can also use a knife to injure each section. Multiple seedlings can be obtained at a time. The piled soil bead is suitable for many axillary buds, clustered branches and branches that are not easy to bend, such as spring, dragonflies, golden finches, hydrangea, June snow, Admiralty flowers, and paste stems. Before the lamination, first cut the cortex at the base of the shoot, and then raise the soil 30-40 centimeters. After that, keep the soil moist. After the shoots were rooted, the soil was planed to open the soil and cut off from the mother plant to be used for planting and becoming a new plant. The upper air layering is suitable for the base not to produce axillary buds, and the cuttings are not easy to survive, and the branches are not easily bent flowers, such as Chinese rose, sweet-scented osmanthus, Milan, Prynne, Magnolia, Duanmu, Schefflera, Dracaena, rubber tree and so on. High pressure is usually performed in the late spring and early summer. Generally, two-year-old strong shoots are used. First peeled or scratched under the twigs to reach the cortex. After treatment with rooting hormones, 3-5 cm at the lower end of the wound, tie the plastic film, and then go up, fill in damp moss, peat soil or fine sand. Seal your mouth and leave a slight gap in order to replenish moisture and receive rainwater. Keep the matrix moist and neither lose moisture in the middle nor get wet. After several months of conservation, the root system has grown to be rich in autumn. After the autumn or late spring, it is cut off from the mother plant, planted in flower pots or open field, and then cultivated for 1-2 years to bloom.
The virus is composed of a nucleic acid molecule (DNA or RNA) with a protein consisting of non-cell morphology of the campal life of the living body. The general symptoms of viral infection are fever, headache, cough and other symptoms of systemic poisoning and viral host and invasion of tissues and organs leading to inflammatory symptoms caused by local symptoms (diarrhea, rash, liver function damage, etc.). Different symptoms of the different virus, some viruses can also damage the myocardium, causing viral myocarditis. There are two types of viral infections, mostly recessive infections (subclinical infections), and a few are dominant infections. Dominant infection can be divided into acute infection and persistent infection. There are many ways of antiviral infection, such as direct inhibition or killing of viruses, interference with virus adsorption, prevent viruses from penetrating cells, inhibit viral biosynthesis, inhibit viral release or enhance host antivirus capabilities. At present, there are several major types of antiviral drugs: Anti-Respiratory virus infection drugs, anti-immune virus drugs, anti-hepatitis virus drugs, anti-herpes virus drugs.
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