After receiving the call, the reporter telephoned Lu Weidong, head of Binhai County Plant Protection Station. According to reports, a number of farmers in the area recently reported similar situations. According to field surveys and analysis, they were initially thought to be caused by potassium deficiency. Another part of the plots had corn leaf spot disease. Due to the early rainy days, more potassium was lost in the soil, and the ability of maize roots to absorb and absorb fertilizer was weakened. The symptoms of potassium deficiency such as yellowing of the leaves were shown. The resistance to stress of maize was also weakened, and diseases such as small spot disease were prone to occur. . The main symptoms of potassium deficiency in maize are usually the yellowing of the old leaves and leaf margins, which then turn brown. The burns are like burns and brown spots or patches appear on the leaves. However, the middle leaves and near the leaf veins remain green, with the lack of Intensification of potassium, the entire leaf becomes red-brown or dry-like, necrotic shedding. The root system is short and small, prone to premature aging, and when it rots badly, it is prone to root collapse. In severe cases, the same symptoms occur in the upper new leaves. The leaves are covered with softness, the stems are thin, the internodes are short, the rate of spike formation is low, and the grains are not full. The resistance to drought of maize plants in the field of potassium deficiency is weakened, and diseases are easy to occur. It is best to spray triadimefon and fungicides with carbendazim and other fungicides at the same time when potash fertilizer is applied. This can effectively prevent corn brown spot disease. , leaf spot, rust, and other leaf diseases.
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Yang Dasheng, Binhuai Town, Binhai County, said in a telephone call that there are several thousand mu of corn in the local area. The redness of the leaves has appeared. There are rust-like spots on the diseased leaves. The old leaves in the lower part of the disease are seriously affected. The rate reached 80%. This situation has also occurred in previous years, and generally began to appear when the heading began. This year, the corn in the 5 to 12 leaf stage has started to develop. He asked what was the cause of this, and why this kind of situation will occur in general this year. Is there any way to cure?