In recent years, the occurrence of root rot in corn seedlings has become increasingly serious and has become an important disease that harms corn. At the early stage of disease, brown spots appeared in the root tips or in the middle of the corn seedlings. The lesions continued to expand, which made all roots brown, and the roots showed water stains, yellowing, and later rot and necrosis. The root bark was easy to fall off. The disease can spread to the ground, with mottled brown spots on stem bases and leaves. In severe cases, the leaves appear to die of fire. The stem base also rots and can be pulled up by hand. The main pathogens of root rot in seedling stage were Fusarium moniliforme and Fusarium graminearum. Fusarium can cause stem rot in the body of the stem after the onset of root rot, and then spreads along the stem to the panicle, causing corn ear rot. The best invasive period for Fusarium during the sowing period is the incidence of root rot. The highest rate. The return of diseased straw to the field can increase the incidence of root rot. The shortage of potassium and the re-application of nitrogen fertilizer in the field will increase the severity of disease. The application of potash fertilizer and organic fertilizer will reduce the incidence of corn root rot. Prevention methods are as follows:

1. Add potassium sulfate, potassium chloride or potassium compound fertilizer, using 6 to 7 kg of pure potassium per acre as a base fertilizer. More strokes, increase the temperature. Strengthen the management of fertilizers and waters, and promote strong seedlings. Elimination of the return of diseased straw to reduce the re-infestation source.

2. With potash irrigation root control, the diseased plant rate in more than 10%, mu with 3 to 5 kg of potassium chloride, or 50 kg of plant ash. Diseased plant rate in 10% to 20%, 8 to 10 kilograms of potassium chloride, or 80 to 100 kilograms of plant ash. The rate of diseased plants is more than 30%, and 10 to 15 kg of potassium chloride in mu, or 100 to 150 kg of vegetation ash. Potassium chloride is used for water and irrigation when applied, and ash should be applied separately. Never use together with chemical fertilizer and water dung. Multiple composite fertilizers plus potassium dihydrogen phosphate foliar spray are also available.

3. Chemical control, with 40% root rot Ning 600 times or 50% carbendazim + 40% aluminum alfa 1000 times or 70% thiophanate + 40% aluminum alfa 1000 times per 100 grams Liquid irrigation roots.

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