How to prevent and control corn bacterial wilt
2021-05-07 15:02:14
Bacterial wilt is an important disease of corn and it is caused by many kinds of fungi. This disease occurs from corn grouting to milk ripening, and the milk matures until the wax ripening period is the most. The main feature is the infection of the roots and stems of 1-3 sections, browning and rot. It is also called stem rot or stalk rot. Within 1 to 2 days after onset, the whole plant quickly lost water, blue and dry, and the ear dropped and stopped development. The leaves with slower onset turn yellow from top to bottom, early wither, and sometimes with blueish leaves. In the early stages of stem disease, browning, water-staining, dehydration, shrinkage and striated depressions, pith were empty, and plants could easily fall down. Cutting the diseased stem with a knife will reveal that the vascular bundle will turn brown. Under humid conditions, white mycelium and pink mold layer can be grown.
Bacteria causing bacterial wilt in corn can be rotted in the soil for a long period of time. They are overwintered with mycelia, oospore, and chlamydospores in plant residues or in soil and under-ripened fertilizers. The cultivation of corn in some areas and the implementation of straw returning in successive years is one of the reasons for the increase of pathogenic bacteria in the soil year by year. Increasing the planting density also provides a beneficial microclimate for the germs.
Prevention of corn bacterial wilt should pay attention to the following points: Breeding and planting resistant varieties. China has already listed anti-blight-blight disease as a target for maize breeding. Different inbred lines and resistant varieties can be used in different regions. Immediately after harvest, remove corn stalks, or compost organic fertilizers at high temperatures, or concentrate them. As much as possible with the crop rotation. Pay attention to waterlogging prevention, reasonable dense planting, and increase zinc fertilizer to improve corn growth and disease resistance. Add organic fertilizer and fungus fertilizer, and use biocontrol bacteria for seed dressing. Treat with fluocinilone (Closure) or Rickett's coated seed or seed dressing.
Bacteria causing bacterial wilt in corn can be rotted in the soil for a long period of time. They are overwintered with mycelia, oospore, and chlamydospores in plant residues or in soil and under-ripened fertilizers. The cultivation of corn in some areas and the implementation of straw returning in successive years is one of the reasons for the increase of pathogenic bacteria in the soil year by year. Increasing the planting density also provides a beneficial microclimate for the germs.
Prevention of corn bacterial wilt should pay attention to the following points: Breeding and planting resistant varieties. China has already listed anti-blight-blight disease as a target for maize breeding. Different inbred lines and resistant varieties can be used in different regions. Immediately after harvest, remove corn stalks, or compost organic fertilizers at high temperatures, or concentrate them. As much as possible with the crop rotation. Pay attention to waterlogging prevention, reasonable dense planting, and increase zinc fertilizer to improve corn growth and disease resistance. Add organic fertilizer and fungus fertilizer, and use biocontrol bacteria for seed dressing. Treat with fluocinilone (Closure) or Rickett's coated seed or seed dressing.
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