The weed community in wheat fields has undergone great changes in recent years, and the malignant weeds such as swine fever have gradually increased, becoming the main weeds in wheat fields. According to the pesticide network , such crop weeds are very difficult to control, and it is necessary to select appropriate herbicide types and appropriate dosages according to different grass conditions and growth periods to achieve good control effects.
Weeds in wheat field are suitable for growth and growth in winter. In the general year, weeds begin to occur 2 to 3 weeks after wheat sowing. Most of them reach the peak of emergence in mid-to-late November. There are also a large number of piglets in the general year to early December. The broad-leaved weeds such as alfalfa continue to sprout and emerge vigorously, and the occurrence of weeds is significantly longer than that of the North China wheat area, which increases the difficulty in controlling weeds in wheat fields. In the early stage of the wheat greening period in the area, the temperature rose faster after the Spring Festival. The weeds that failed to be controlled in the early stage began to grow rapidly after the wheat returned to green, which was difficult to control and often caused serious damage to wheat. The prevention and control of weeds in wheat fields in this region should be divided into three stages. The corresponding prevention and control measures should be taken for the characteristics of each stage, and the prevention and control of winter pre-war is particularly important.
The first stage: the winter wheat production area with more application of herbicides in the middle and south of Huanghuaihai, the early wheat before the winter, from the middle of October to the beginning of November, for the suitable sowing of wheat, pigs and other broadleaf weeds It is more advantageous to produce seedlings and prevent and control. It should be applied in time for herbicide weeding; however, it is easy to relapse after application. During this period, pesticide manufacturers recommended the following herbicides: benzosulfuron, thiasulfuron, bensulfuron-methyl, bensulfuron-methyl and metsulfuron-methyl (only partially acidic soil in the Yangtze River basin); benzenesulfuron-methyl WP + chlorsulfuron (Only part of the acid soil in the Yangtze River Basin); in this period, attention should be paid to the grievance, weed size and application period, and the type and dosage of the agent should be properly adjusted. The earlier the application, the more appropriate the dosage should be.
The second stage: the early winter wheat season, from the middle of November to the beginning of December, is a relatively favorable period of prevention and control. During this period, the weeds have basically come out, the temperature is high, and the herbicide should be applied in time. However, for heavier and larger wheat fields, some quick-acting herbicides should be used. In this period, pesticide manufacturers recommend the following herbicides: benzosulfuron, thiasulfuron, bensulfuron-methyl, thiasulfuron Pesticides such as bensulfuron-methyl and thiasulfuron can not be applied too late in this period. When the temperature is lower than 8 Â°C, the herbicidal effect is lowered, and the safety of wheat is poor or phytotoxicity occurs.
Efficient prevention and control of malignant weeds, not only to understand the grass conditions and growth period, but also to choose the appropriate herbicide and the right amount of drugs, the above prevention methods for your reference. Pesticide control methods are available at .
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