Symptoms Symptoms The diseased plant leaves yellow and wither, the stem base and main roots turn red-brown dry rot, with longitudinal cracks or red streaks, the lateral roots are rotten or rarely, the diseased plants are easily pulled out of the soil, and the primary root vascular bundle becomes Brown, when the humidity is high, the root minister has a mold.
Pathogens in China generally believe that the main pathogen of the disease is Fusarium solani, and there are reports of Fusarium oxysporum, F. cruzi and so on. The isolates of Rhizoctonia solani kuhn from Rhizoctonia solani kuhn, Fusarium oxysporum Schlecht in Inner Mongolia are the main isolates. Fusarium oxysporum and F. Solani (Mart.)Sacc. Fusarium spores are all known as semi-known fungi. The separation frequency was 76.5%, respectively. o% and 5.9%.
Pathogenesis and Pathogenesis Fusarium is a soil inhabiting bacteria that proliferates in the soil for a long period of time. The bacteria spread by water flow, tillage, and invade through root wounds or branch cracks directly from fork roots and cracks at the base of old seedling stems. Underground pests and nematodes inflict damage to pathogenic bacteria. Excessive management, poor ventilation, and moisture-tolerant plots are prone to disease. Jiangsu originated in mid-April, and June-July turned cloudy after rainy weather. Sudden increase in temperature caused susceptibility to disease. Plants often died as a result.
Control methods (1) Control soil temperature and prevent moisture retention. (2) Perform crop rotation, implement seeding or sorghum cultivation. (3) Prevent the seedlings from causing wounds during storage, transportation and transplanting, and pay attention to the prevention and control of underground pests. (4) 50% carbendazim and licorice 1:1 mixed 200 times liquid soaking seedlings for 5 minutes, transplanting 1-2 hours after transplanting, high control effect. (5) spraying or watering 50% of thiophanate-methyl or carbendazim WP 800 to 900 times, 50% benomyl WP to 1500 times at the initial stage of disease.
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