Wheat yellow mosaic disease is a newly-produced wheat disease in recent years. Occurred in Linyi City and other cities last year. The rate of serious diseased land masses has reached 90%, and individual plots have caused seed destruction, which has seriously affected the growth of wheat. The pathogen is wheat yellow mosaic virus, and the virus-mediated mediator is polymyxa glutinosa. It is a kind of weak parasite that habitually colonizes the soil in the soil. Under natural conditions, it spreads mainly through infected soils (viruses), diseased roots, and diseased fields.
Wheat yellow mosaic disease is infested but not obvious during the autumn seedling stage of wheat. The main hazard period and disease stage of the sick field are in the turning green stage of wheat. The suitable temperature for disease development is 5-15°C. When the soil temperature reaches 20°C or more, No longer show symptoms. At the onset of the disease, the leaves showed chlorotic or necrotic spindle-shaped streak. On the other hand, the leaves exhibited mosaic symptoms. Subsequently, the entire diseased leaf was yellowed and withered. The plants with severe disease were dwarfed, the tillers were reduced, the internodes were shortened and thickened, and the base of stems became hardened and aged, and the heart yellowed and withered. Generally, it can cause 10-30% of production loss, and severe cases can reduce output by more than 50% or even no more.
Because it is a new disease, there is no good cure and control agent, except for the selection of disease-resistant varieties, rotation with non-grass crops, appropriate late sowing to avoid virus infection, and reduce the disease. Spraying bactericidal agents such as chlorothalonil at the early stage of disease can reduce the occurrence of yellow mosaic disease in wheat and at the same time topdressing fast-acting nitrogen and phosphate fertilizers to promote plant growth and reduce damage and loss.
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