Corn is an important field crop in China, so the health of corn has been a concern. During the growth of corn, the emergence of bacterial wilt has seriously affected the growth of corn. This article will introduce the causes and prevention methods of corn bacterial wilt.
The cause of corn bacterial wilt
Corn bacterial blight mainly occurs in the corn milk maturity stage. In the early stage of the disease, the leaves of the plant protruded, and the blue-gray was dry and dry, which was like frost; the roots and stems showed watery rot. Further development of the leaves gradually yellowed, the base of the roots and stems gradually browned, the vascular bundles of the pith were discolored, and the base of the stem was hollow and softened, causing the whole plant to fall. Light onset also causes the ear to sag and the grain weight to decrease. The first is root disease, localized pale brown water-stained lesions, gradually expanding to the entire root system, showing brown rot, the final root becomes hollow, the root hair is sparse, the plant is easy to pull up; the diseased plant leaves are water-stained from top to bottom. It quickly turns into a blue-gray dead, then gradually turns yellow; the ear is drooping, the handle is flexible, and it is not easy to squat; the grain is dry, dull, and the weight of 1000-grain is reduced.
Incidence conditions of maize bacterial wilt
1. Climatic conditions: The onset of corn bacterial wilt is in the late stage of corn growth, mostly in humid climate conditions. Therefore, the climatic conditions from tasseling to maturity have the greatest impact on disease occurrence, and there are many rainfalls in July and August. The amount of rain is large, and the occurrence of corn bacterial wilt is serious. If it suddenly turns fine after continuous heavy rain, the temperature rises sharply, which often leads to a pandemic blight, because the rainfall causes the spore germination and invasion of the pathogen, so that September In the first half of the year, the plants with weak resistance to maize were heavily ill.
2. Growth period: The growth period of corn is different, the degree of disease is different, the wax maturity period is heavier than the milk maturity stage, and the milk maturity period is heavier than the filling stage. The symptoms are rarely expressed before the tasseling, and the more serious the disease is in the late growth stage.
Prevention and cure methods of corn bacterial wilt:
1. Strengthen cultivation management. Rational fertilization, avoid partial application of nitrogen fertilizer, pay attention to the elimination of accumulated water in the rainy season, phased the soil, timely ploughing loose soil to avoid various damages.
2. When the base of the stem is inoculated, the surrounding soil can be opened in time to reduce the humidity and reduce the infection, and then cultivate the soil after the onset of the disease.
3. Chemical control: When a sporadic disease plant is found in the middle and late stages of corn growth, it can be rooted with 300 times of metalaxyl or 500 times of carbendazim, and 500 ml of each solution.
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