Soybean blight, very serious, seriously ill field, if you do not take measures, may result in a failure! Soybean blight is commonly known as "dead tree", "stumble", "black root disease", and their diseases and pesticides are controlled as follows.
Incidence conditions: continuous cropping is severe, and the incidence of rotation is light. The accumulation of bacteria in the soil has increased the amount of bacteria. The seed quality is poor and the incidence is heavy. Seeds that are moldy and degenerate must be seriously ill, and the pathogen of blight can be transmitted by seeds and is associated with decreased seed germination potential and disease resistance decline. The earlier the sowing, the longer the growth period of the seedlings in the field. The diseased stubborn manure is not decomposed, and can spread the disease. Fields with many pests in the ground, poor soil quality, lack of fertilizer and poor growth of soybeans are seriously affected.
Symptoms in the field: Soybean blight occurs only at the seedling stage. The main roots of the seedlings and young plants have reddish brown pits on the base of the stem near the ground. The cortex is cracked and ulcerated. The mycelium of the pathogen is initially colorless and gradually changes. It is brown. When the disease is serious, the shape is short and the growth is slow. The stem on the ground is russet brown, and the cortex is cracked and ulcerated.
At the beginning of the disease, the following agents were sprayed: 40% aluminum triethylphosphonate wettable powder 200 times solution; 70% ethyl phosphorus·manganese zinc wettable powder 500 times solution; 58% metalaxyl · manganese zinc wettable powder 500 times liquid; 69% Anke Mn-Zn wettable powder 1000 times liquid every 10 days or so, continuous control 2~3 times, and spray evenly.
Control method: use resistant varieties. Dressing with pesticides. Seed dressing was carried out with 40% methyl chlorophosphorus emulsifiable concentrate or 50% thiram WP. Real-life rotation, three-year rotation with grass crops. Soybeans are grown on well-drained, high-dry plots. Low-lying land is planted in ridges or sorghum deep trenches, and is reasonably densely planted to prevent excessive surface moisture and timely drainage after rain. Watering should be based on soil moisture and temperature.
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