Chinese cabbage has a large planting area in Yutian County. In recent years, clubroot disease has occurred from time to time, which has a great impact on the quality and yield of Chinese cabbage. The symptoms are as follows: the seedling stage suffers, and the seedlings die when they are severe. Cabbage plants are wilting and grow poorly. On the main and lateral roots, there are round or oval nodules with different sizes. The initial tumor surface is smooth, and then becomes rough and cracked. The symptoms of the aboveground plants were not obvious at the early stage of disease, and they grew slowly and dwarfed later. The leaves at the base of the noon wilted and returned to normal sooner or later, and the leaves turned yellow until the withered and died.
Cabbage clubroot disease is a kind of soil fax fungus disease, which occurs in cruciferous vegetables. The clubroot disease of Chinese cabbage is difficult to eradicate. After the disease occurs, the bacteria directly interfere with the transportation of nutrients to the upper parts of the plants. The vegetables grow to medium-term, and the roots rot in the early stage, causing large areas of vegetables to die. huge loss.
Due to the serious problems in recent years, the accumulation of fungi is large, and clubroot disease of Chinese cabbage is more likely to occur. Control methods: In serious disease areas, non-cruciferous crops should be rotated for more than 6 years, and weeds must be removed. After the food is harvested, the root cause is completely removed and the destruction is concentrated. Cultivation of Chinese cabbage in low-lying or poorly-drained plots requires cultivation in the form of sorghum. Appropriately increase lime, adjust the acidic soil to slightly alkaline, soaking lime 75-100 kg per acre before sowing, disinfect it; the best period of prevention and control is sowing cabbage to 2-3 leaf stage, with 15% evil spirit Aqueous solution 500 times, 58% metalaxyl mancozeb WP 400-500 times or 75% pentachloronitrobenzene WP 700-1000 times Irrigation, irrigation per hole 250-500 ml, Interval 10 days, even irrigation 3 times. For Chinese cabbage disease strains at the late stage of clubroot disease, the control of the medicaments cannot be well controlled. In order to prevent the spread of the disease in the field, the diseased plants should be cleared out of the field, burned or buried in a timely manner, and should not be discarded at will, and then the diseased holes should be closed with lime and the roots should be treated with carbendazim, chlorothalonil and other agents. .
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