Wheat bush dwarf disease can cure

Dwarfism can occur in the whole growth period of wheat. In the early stage of the disease, intermittent discoloration lines appear between the white and yellow leaves. Afterwards, the uneven yellow-green stripes develop, the tillers increase significantly, and the plants are dwarfed. 20 days after sowing of winter wheat can show symptoms. Plants that are infected at the seedling stage generally cannot die when they die through winter. After the plants that survive, the tillers continue to grow after returning green. The growth is delicate, and there are obvious yellow and green stripes on the leaves, which are severely dwarfed. Generally, they cannot head and die beforehand. Plants that had not shown signs of disease and early spring disease before winter infection were gradually manifested in the stages of turning green and jointing. They showed dark green leaves and stout stalks, and they could not stand heading or were not strong after heading. Plants that were infected at the jointing stage showed stripes on the upper fresh leaves, which allowed for heading, but the number of grains per panicle was reduced and the grains were thin. Plants infected at the booting stage had no obvious symptoms. The plant is severely dwarfed after being infected, and the number of births is increasing indefinitely. This is an important feature of the disease that distinguishes it from other viral diseases. It can be judged whether the disease has caused bushy dwarf disease.
Wheat plexus dwarf virus disease, the pathogen of the northern sash mosaic virus, spread by the planthopper. After taking the sap from the host plant, the Laodelphax striatellus can't transmit the poison immediately. It is necessary to pass a circulatory period in the insect body to transmit the virus. The mean circulation temperature at 26.7°C averaged 10 to 15 days, and averaged 15.5 days at 20°C. Once the poison has been picked up, it can be transmitted for life, but it cannot be passed on to the offspring through eggs. The winter wheat planthoppers in the winter wheat area migrated from the virus-bearing overwintering host to the hazard of the wheat field in autumn, resulting in the onset of early sow autumn seedlings. Poisonous nymphs in the rhizosphere of the weeds or earth seams overwintering, the next year moved to the wheat plant harm. After wheat matures, the flyheads migrate to summer wheat and rice and other grasses. The incidence of susceptible strains is related to temperature. When the average daily temperature is 16°C, the incubation period is generally 10 to 11 days. When the average daily temperature is 22°C, the incubation period is generally 11 days. Wheat bush dwarf virus has a wide range of hosts and can infect 62 grass crops and weeds. Wheat, barley, etc. are the main wintering hosts of the virus. Winter wheat sowing is too early, summer and autumn are rainy, winter is warm and cold, and wheat fields adjacent to grassy slopes and weeds are heavy.
There is no medicine to cure after the occurrence of bushy dwarf disease in wheat. The prevention and control of the virus-mediated mediators is the most fundamental measure to control the disease. Remove weeds from fields and fields, but early sowing can reduce the incidence of diseases. When the emergence of wheat in autumn reaches 20%, if there is a large amount of insects in the field, use imidacloprid and other agents to prevent and control; in the middle and late stages of wheat growth, combined control of aphids and other pests can be controlled by imidacloprid and other agents. In lightly affected fields, spraying anti-viral drugs such as 1.5% phytosanitary II or 20% virus A can reduce disease in the field to some extent.

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