The control method of corn sheath blight
One, the symptoms of sheath blight
Main damage corn sheath, fruit spot is round or irregular shape, light brown, water immersion, disease, health department boundary blurred, lesions contiguous healed into larger moire plaques, the middle is light yellow or withered White, edge brown. When the humidity is high, the lush mycelium can be seen at the site of the disease, and then a small white pompon is formed and gradually turns into a brown sclerotia. Occasionally mottled lesions appear in the base of the stem. The stems of diseased plants are soft and disintegrated.
Second, the incidence of law:
The sclerotium is overwintering in the soil and infects corn in the second year. It first develops on the leaf sheath of the stem base of the corn and gradually develops upwards and four weeks. It generally begins to develop at the jointing stage of the corn. The disease develops quickly during the tasselling stage, and the damage is heavy during the toxoplasma filling stage. . The corn is planted with flails, and the incidence is heavy; the water, fertilizer and density are high; the humidity in the field is large, the air and light are poor, and the incidence is heavy. The number of precipitations in July and August is high, and the rainfall is large, which is easy to induce damage.
Third, prevention and control methods:
1. Varieties of disease-resistant varieties with moderately sized and upwardly inclined leaves grow well in the fields with good ventilation and light transmission and light onset.
2, strengthen the cultivation and management of reasonable fertilization, to avoid partial nitrogen fertilizer, reasonable irrigation and drainage, reduce the humidity in the field, improve the resistance to disease. In the initial stage of disease, the diseased leaf sheath is removed from the lower parts of the corn plants, which can reduce the incidence.
3. Chemical control In the early stage of disease, use 100-150 milliliters of Jinggangmycin per mus, or 25 grams of 20% powder, or 150-200 milliliters of agricultural anti-120 fluid, add 50-60 kilograms of stem and leaf spray.
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