The winter crop seedling stage is the most suitable stage for effectively controlling weeds in the field. Weed plants are small during this period and are relatively more sensitive to herbicides. However, once the medication is inadvertent, it is easy to cause major economic losses.
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　　 1. It is necessary to select the herbicide according to the grass phase, strictly control the application period and the amount of application, and achieve uniform spray to prevent re-spraying and leaking. Pay attention to the soil moisture when applying the medicine, especially the use of pre-emergence soil treatment agent. Generally, it is effective after the rain and when the soil is wet. If the soil is dry, the amount of water per mu can be increased to 60 liters, or used after watering to improve the weeding effect. In case of drought, the drought should be first applied and then applied.
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　　 2. Cinozocilin is strictly forbidden to be used in barley fields ; high-osmotic isoprote should be used to control the weeds in wheat fields to pay attention to the influence of cold wave, and apply cold medicine at the cold tail to avoid phytotoxicity.
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　　 3. Herbicidal and its compound preparations should not be used in rapeseed and mustard-type rapeseed fields, and should be used at temperatures above 8 °C.
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　　 4. For the new varieties of herbicides to adhere to the "test, demonstration, promotion" principle, it is strictly prohibited to use no "three certificates" herbicide varieties. For herbicides that have not been used locally or have not been used on recommended crops, the first demonstration should be carried out. Before the application technology is mature, it should not be blindly promoted in large areas to avoid phytotoxicity.
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　　 5. Stop using long-lasting herbicides that have a greater impact on the growth of the crops. Herbicides containing metsulfuron and chlorsulfuron are not recommended for use in wheat fields. It is not recommended to use herbicides containing methamsulfuron in rapeseed fields to avoid phytotoxicity to the crops.
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In addition, the prevention and control of pests and diseases in the seedling stage can effectively control the spread of viral diseases. The rapeseed seedlings have a rate of 3% to 5%, or there are more than 10% of the plants after transplanting . In the area where rice black-streaked dwarf disease, stripe leaf blight, and corn virus disease occur, it is necessary to do a good job of wintering fly ash, combined with chemical weeding, and use 30% pymetrozine wettable powder for 30 grams.
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