Corn madness disease, known as whole plant disease, is a common disease during corn cultivation, and it often occurs in Ningxia, Sichuan, Shanxi, Hebei and other local planting areas in China. The damage will lead to a reduction in the fruit firming of the corn fruit, and even in the case of serious particles. So what are the specific symptoms of corn madness? What are the transmission routes? How to prevent and cure? The following small series will take you to understand.
Before understanding the symptoms of the disease, we first need to know the cause of corn madness. The rainy season is the high incidence of corn madness, the long-term accumulation of water in the field, and the high soil water content, which leads to the disease. In addition, the large-scale cultivation of susceptible hybrids is an important cause of the incidence of mad top diseases.
First, the symptoms
Corn madness is accompanied by the whole growth and development of corn. The typical symptom is local or complete hyperplasia of tassels, resulting in a pile of leaf-like structures on the ears. The early diseased corn leaves are lighter in color and have yellow stripes, the shape of the leaves is curled, and the plant height is also severely atrophied, less than half of the healthy plants.
After the tasseling, the symptoms of mad top disease become more obvious. The common symptoms are tassel hyperplasia, and a large number of small leaves are clustered on the tassel, and the whole appears as a round hydrangea. The performance of the ear is different from that of the tassel, which is mainly characterized by the metamorphosis of the tip of the temporal lobe, and the filament is also stopped, which is the main reason for the small number of corn fruit.
Another common symptom is the abnormal formation of the upper part of the corn leaf. The plant height development is far beyond that of the normal corn plant. The leaves have a thick thick touch and yellow streak. Most of these diseased plants have no ears and tassels, so it is difficult to complete pollination and flowering. In addition, one symptom that needs attention here is that the corn heart leaves are curled into a oxtail shape, which can also be caused by other reasons, so it is necessary to distinguish from the mad top disease.
Second, the route of transmission
Corn madness is a fungal spore-infecting virus. Its pathogens are parasitic in the corn disease or in the soil. After the corn is planted, the pathogen begins to divide the oospores and start to be sent in the form of zoospores. New host. Corn is the most susceptible period in the bud stage, and the pathogen invades the corn bud sheath through this propagation mode, and then invades the entire plant body.
In addition, the seeds of the infected bacteria can also be spread over long distances, thereby inducing new infection areas. According to the research, the normal grain-bearing rate of the normal plants is high, and the risk of disease transmission is greater.
Third, prevention measures
1. Select corn seeds with higher resistance varieties during breeding and planting, and prevent the spread of diseases from the early stage.
2. The newly planted corn seeds should be kept away from the diseased areas as much as possible, so that the seeds of the diseased fields are not used, and they are not transferred from the affected areas.
3. When the disease occurs, the diseased plants should be removed in time and taken out of the field to prevent the disease from spreading.
4, regular anti-virus sterilization work, can be used 58% metalaxyl · manganese zinc (Russin) or 250ml anti-virus sputum spray control.
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