In recent years, yellow leaf disease has become more prevalent in soybeans and other legume crops. If it is not controlled in time, it will cause serious damage to crop growth, such as premature aging, falling leaves, falling flowers, and ineffectiveness.
Type of disease: lack of type, bacteria type, lack of sugar and so on.
Hazardous features: It seriously affects the balanced production of soybeans. When the leaves are light, the roots are yellow, the roots are divorced and brown, the roots are stunted, the root nodule is less, and the plants are short; when they are heavy, the soybeans are dead and yellow. In the early stage, the diseased leaves became yellow, the plants were short, and no scab was found. In the mid-term onset, no scab was found even in the scab, and even if the grains were empty, serious reductions in production and even crop failure were observed.
Causes:
1, poor disease resistance. Different varieties of disease resistance vary greatly. The resistance of purple soybean varieties is often strong and the incidence is light; white flower soybean varieties have poor disease resistance and heavy disease incidence.
2, soil compaction. Fertilizers are applied in large quantities for a long period of time, with little or no application of farmyard manure, resulting in soil compaction.
3, lack of element is serious. The continuous cropland often suffers from deficits in nutrients, especially iron, manganese, boron, molybdenum and other trace elements, hinders the normal growth of soybean roots and the formation of root nodules, reduces the nitrogen fixation capacity of plants, and leads to yellowing of the upper leaves.
4, bacterial infections. The roots of the diseased plants grew poorly, and when the roots were severe, the roots became black, the stems were rotted, and the leaves were yellow.
5. Weather conditions. Long-term continuous rain, poor photosynthesis causes plants to lack of sugar, resulting in yellow leaves; continued high-temperature drought leads to plant transmission tissue suppository, affecting the transport of water and nutrients, eventually causing soybean yellow leaves; After a sudden rainstorm, high temperatures, will also accelerate yellow leaves The spread of the disease.
Prevention:
1. Select good varieties with good disease resistance.
2. Apply more farmyard manure and microbial fertilizer to improve soil structure.
3, balanced formula fertilization, supplement of trace elements (zinc, iron, sulfur, manganese, boron, molybdenum, etc.).
4, can be sprayed on the onset of trace fertilizer, spraying zinc sulfate 2 per acre two, with fungicides "guard up to" or "18% imi fresh rosin copper", with plant regulators "half green" or "Sanri" or "Huimanfeng" was changed to green in three days after spraying and returned to normal.
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