The occurrence of wheat root disease and control measures
In recent years, due to the adjustment of planting structure and the increase of chemical fertilizer application, the occurrence of wheat root disease has been increasing year by year.
Root diseases Root diseases of wheat are mainly caused by the following pathogens: Rhizoctonia solani, wheat full-bleeder, and wheat root rot. The corresponding root diseases are caused by wheat sheath blight, wheat full-blown disease, and wheat root rot. disease.
The reasons for the occurrence of heavy crops: wheat planting year after year, the amount of bacteria in the soil increased year by year, resulting in an increase in the incidence of root diseases. Variety resistance is weak: The large-scale planting of susceptible varieties provides good parasitic conditions for the spread, reproduction, accumulation, and spread of diseases. Unreasonable fertilization: Farmers reapply nitrogenous fertilizers, lightly applied phosphorus and potassium fertilizers, and organic fertilizers to reduce the content of organic matter in the soil, worsen the soil structure, and the wheat plants are not robust and have poor stress resistance. Improper management: In production, plant management is extensive, plant density is high, ventilation and light transmission are poor, irrigated land and low-lying fields have high water holding capacity and poor drainage. Improper prevention and control: Wheat seed dressing only uses pesticides instead of fungicides.
Selection of disease-resistance control measures: elimination of susceptible varieties, selection of disease-resistant varieties and comparison of disease-resistant varieties. Reasonable fertilization: Apply more miscellaneous fertilizer before wheat sowing, increase soil organic matter, increase phosphorus and potassium fertilizers, and apply proper amount of nitrogen fertilizer according to soil fertility. Rotation of crop rotation: rational rotation, adjustment of planting structure, adoption of scientific planting methods. Pharmaceutic seed dressing: before sowing with wheat, use 20% triadimefon EC 50 ml or 10% triadimefon WP 150 g water 2 to 3 kg, seed dressing 50 kg.
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