Symptoms and prevention of clubroot disease in rape

Rapeseed is a major oil crop in the mountainous township of Yingjiang County. Rapeseed tuberculosis is a common disease in this county, and rapeseeds, particularly in Sudian Township, Zhina Township, Jixi Town, and Mangshan Township, cause more diseases. The main symptoms and control methods of clubroot disease are briefly introduced.

First, the harm symptoms

The main damage to the roots of rapeseed, the main root or lateral root enlargement into a spindle-shaped or irregularly shaped tumor, the initial tumor surface is smooth, white, late tumor epidermis becomes dark, easy to be infected by soil bacteria and decay. In the early stage of onset, the growth of the aboveground part is retarded and short, and the basal leaf blade is wilted at noon. It can be recovered sooner or later. The leaves of the base gradually turn yellow after death, and the whole plant is dead when it is severe.

Second, control methods

(1) Rotation: Rotate with crucifer crops for more than 3 years to prevent rape growing in low-lying water or acidic soils.

(2) Strengthen cultivation and management: Dispose of stagnant water in the field in time, reduce the humidity in the field, seriously remove the diseased plants and carry them out of the field to burn them. Disperse lime around the sickles to prevent the spread of germs.

(3) Chemical control: For the rapeseed fields with heavy emphasis, they should be sprayed with 75% chlorothalonil 1000 times solution in time, and be used once every 10-15 days for continuous 2-3 times; or with chlorothalonil. 3 kg of 25-30 kg ground soil is applied to the pond before sowing.

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