First, the symptoms of harm
Mainly harming the roots of rapeseed, the main root or lateral roots are swollen into a spindle-shaped or irregularly shaped tumor. The initial surface of the tumor is smooth and white, and the epidermis of the tumor becomes dark and rough in the later stage, which is easily infected by soil bacteria and rot. In the early stage of the disease, the aboveground part of the growth is slow and short, and the leaves at the base have a wilting phenomenon at noon. It can be restored in the morning and evening, and the leaves at the base gradually turn yellow and die. In severe cases, the whole plant dies.
Second, prevention and treatment methods
(1) Rotation: Rotate with cruciferous crops for more than 3 years to avoid growing rapeseed on low-lying water or acid soil.
(2) Strengthening cultivation management: timely eliminate water in the field, reduce the humidity in the field, carefully remove the diseased plants and carry out the burning outside the field, and scatter the lime around the diseased pond to prevent the spread of the bacteria.
(3) Chemical control: For live rapeseed fields with heavy weight, use 75% chlorothalonil 1000 times liquid to pour the pond in time after sowing, once every 10-15 days, continuously pour the pond 2-3 times; or use chlorothalonil for acre 3 kg of fine soil 25-30 kg should be applied once before sowing.
More pesticide knowledge , please pay attention to China Pesticide Network
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