The occurrence trend of corn sheath blight and its prevention and control

Corn sheath blight is an important disease of corn, which mainly damages the leaves and stalks of corn. When it is serious, it can harm the ear, affect the heading and fruiting, and even cause the plant to die prematurely. In recent years, there has been a gradual increase in our area.

First, the trend

In recent days, the rainy days are relatively high and the humidity in the fields is high, which is conducive to the transmission of pathogens of sheath blight. According to my survey recently in Dawan, Gulu, Dasheng and other towns, the strain rate was 0.2-1.8% with an average of 0.5%, which was 0.1% higher than the same period of last year. The occurrence period was 3-5 days earlier than last year. It is expected that the peak of the hazard will occur in mid-June. It is estimated that the corn sheath blight in our region is moderately heavy, with an area of ​​about 60,000 mu.

Second, prevention and control indicators

The diseased plant rate is 15-20%.

Third, prevention and treatment advice

1. Forecasting and forecasting: Combining fixed-point surveys with general surveys, the plots that meet the prevention and control targets should organize farmers to carry out prevention and control.

2. Agricultural measures: Scientifically and reasonably use strong stalks to attack manure fertilizers, use less nitrogen fertilizers, increase application of compound fertilizers and farmyard manures, remove dehumidified sludge, remove diseased leaves, and burn them in time. Prevent weeds, increase ventilation and light transmission in fields, and increase resistance to disease.

3, unified defense rule: the use of high efficiency and low toxicity of pesticides, in accordance with the four unified methods of corn sheath blight for the implementation of a special unified defense rules. That is, unified control of time, unified pharmaceuticals, unified technology and unified personnel.

4, chemical prevention

(1) Prevent and control the appropriate period of corn tasseling.

(2) The recommended dosage of mu is 20% Jinggangmycin crystal powder 50g or mu 50% azole alcohol dispersible granule 6g watered 30-60kg spray, it can also adopt the method of coating stalks, after a week of prevention and treatment once.

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