It is an important economic crop in Yishui County, and its annual planting area is over 500 mu. The larvae of stalk blight have occurred recently in some plots. Yellow and dead stems and leaves have appeared. This not only causes a decrease in production, but also has a significant impact on quality.
The stalk blight disease mainly damages the sheath and culm. The leaf sheath became infected, and the dark green irregular water-stained lesions appeared at the base of the leaf sheath. Afterwards, it spread to the entire leaf sheath. After the diseased part was dry, it was gray and white and was a short black strip. The stalks became infected. In the initial stage, dark green irregular water-stained lesions appeared. After the lesions appeared dark yellow, the diseased tissue became soft and sags. Black dots or short-spotted spots appeared on the stalks, sometimes concentrically arranged. The lesions on the diseased stalk progressively expanded upward into strips of yellowish large spots, and a large number of mild gray mold layers were seen, while the lower part of the lesions remained green.
The pathogenic bacteria mainly overwintered with mycelium in the soil, and the new production area took the fungus bulb as the initial infestation source. Spores are transmitted by wind, rain, and irrigation water. Frequent rainfall and heavy rainfall make them susceptible to disease. Low-lying terrain, early line closure, poor ventilation and light transmission, partial application of nitrogen fertilizer, growing too busy, the stalk tender field weight.
In the field of stalk blight, it should be sprayed with 25% carbendazim WP 250 times or 50% thiophanate-methyl WP 800 times, and every 7 to 10 days for continuous control. 3 to 4 times. At the same time, it is necessary to rationalize fertilization, increase phosphorus and potassium fertilizers and organic fertilizers, especially silicon-containing phosphate fertilizers, increase the epidermis silicidity of plants, and enhance plant disease resistance.
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