When planting corn, it is easy to develop diseases. Among them, corn sheath blight is the main disease. The following are the control measures for corn sheath blight?
Temperature and humidity conditions are the main factors affecting the occurrence of corn sheath blight. The temperature of 25-30 °C and the relative humidity of more than 90% are suitable climatic conditions for the development of corn sheath blight. During the disease occurrence period, especially during the rainy season, the rain period is long, the rainy days are high, the humidity is high, and the disease is heavy. In addition, the incidence of soil fertility is relatively light, on the contrary, the incidence is heavier; the disease with long growth period is heavier than the one with short growth period; the continuous cropping field is heavier than the crop field; the application of nitrogen fertilizer is too much, the growth is too strong, the density is too large, the plant The field with poor ventilation and light transmission conditions is seriously affected; the terrain is low, and the poorly drained fields are seriously affected.
In view of the occurrence characteristics of corn sheath blight, the following measures should be taken for prevention and control. (1) Implement rotation and change the sick bodies in the remaining fields in time. (2) Select high-quality and high-yield varieties with short growth period and strong disease resistance. (3) Scientific operation of fertilizers. Apply sufficient base fertilizer, apply nitrogen fertilizer, increase organic fertilizer, supplement potassium fertilizer, and apply phosphorus and zinc fertilizer. (4) Seed dressing. Seed dressing was carried out using a soaking seed with a seed amount of 0.02% or a Lingfu mixture with a seed amount of 2%. (5) Reasonable close planting. Expanding and planting plants to improve ventilation and light transmission conditions in the field. (6) Strengthen field management. Support the field ditch system to reduce the humidity in the field and control the disease conditions. The roots of the soil are prevented from lodging and inhibit the growth of mycelium. The leaves of the old leaf disease at the base were removed and taken out of the field for destruction. (7) Timely application of drug control. When the rate of diseased plants in the field reaches 3%-5%, use 400-500 ml of 5% Jinggangmycin water per acre, or 50-60 g of 40% Rhododendron wettable powder, or 50% bacteriostatic wettability. 40 grams of powder, spray 50-70 kg of water, and control once every 7-10 days. The diseased leaf sheath should be removed before application.
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