In recent years, the root barley tuber disease in some fields in Hongta District is seriously endangered. If prevention and control are not done in time, it will reduce the 1000-grain weight and yield of rapeseed, and endanger the production of severe crops. Therefore, prevention and control of clubroot disease is very important.
1. Harmful symptoms mainly affect the roots of rapeseed, and the main root or lateral roots expand into spindle-like or irregularly shaped tumors. The tumor surface is smooth and white at the beginning of the tumor. The epidermis of the late tumor is dark and rough, and it is easily infected by soil bacteria and rot. 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.
2. Control methods (1) Crop rotation: Rotate with crucifer crops for more than 3 years to avoid rapeseed growing in low-lying water or acidic soil.
(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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