According to many years of investigation and control of corn field application of post-emergence herbicide-induced phytotoxicity and weed control effect, it is proposed to spray post-emergence weeding "six to six do not" requirement, in order to achieve a good effect of field weed removal, corn It is also protected from the purpose of phytotoxicity.
First, when the application of corn fields: "To distinguish the species, do not blindly use drugs." As most of the post-emergence herbicides for corn are nicosulfuron, some corn varieties are sensitive to this ingredient and are prone to phytotoxicity. Some products indicate that they are prohibited from use in maize inbred lines, sweet corn, sticky corn, and Denghai series. Therefore, it is said that post-emergence herbicides cannot be used for any kind of products. Read the product descriptions in detail. Can be used to use, improper use is not necessary to prevent corn seedlings produce phytotoxicity.
Second, do the dispensing: "To be diluted twice, do not mix water and drugs directly," especially powder-type pharmaceuticals. The secondary dilution is like a chef making a porridge. Under the premise of selecting a certain amount of water, first mix a small amount of water with the medicine, and then add the remaining water and spray evenly after mixing. Avoid the uneven mixing of water and medicine, where weeds die when the piece is sprayed to the medicine, and weeding effect of weeds continues to grow where the water is sprayed.
Third, when spraying do "do not spray high spray." Here, "low, high" means that the temperature is low and high. That is, before 9 o'clock in the morning when the temperature is lower in the day, the drug is sprayed after 4 o'clock in the afternoon. Do not spray on high temperature, dry weather mornings, noon or afternoon, so that the amount of herbicides that enter the weeds is limited, absorption is insufficient, and the effect of weeding is affected. At the same time, corn seedlings subjected to high temperature spraying are also prone to phytotoxicity.
Fourth, weeding: do not spray the old. Grasp the weeds from one leaf to the other. Weeds are sprayed in a favorable period with a small area of ​​spraying and low resistance. Don't wait till the weed grows to more than 10 cm high, and spray it with a green eye. In hot and dry years, although the weeds are short, but because of the long growth time, the root system is developed, forming a leafy gray "little old grass." Should increase the amount of spray liquid, liquid per mu of not less than 40 kilograms, spray the whole plant spray weed, do not hesitate to water without hesitation, otherwise it can not reach the effect of net weeds.
5. When weeding and pest control, we must do the following: "To mix pesticides with pyrethroids, do not mix organic phosphorus pesticides." When pests occur at the seedling stage of the corn field, they can be weeded and pest-treated at the same time to save labor and time by spraying post-emergence herbicides. However, mixed pesticides should be selected pyrethroids and carbamate insecticides, spraying should pay attention to avoid the leaves as much as possible, anti-drug liquid irrigation. In severe years of Swedish flies or thrips, herbicides can be used in combination with imidacloprid or acetamiprid, but the control of the two insects need to spray the heart leaf, if mixed with herbicide spray heart leaf pests, corn seedlings prone to occur Injury should be sprayed with herbicides in the front and imidacloprid or acetamiprid in the back to avoid corn seedlings. One week before and after the spraying of the herbicide, spraying of organophosphorus pesticides is strictly forbidden, otherwise corn seedlings will suffer phytotoxicity.
Six, corn seedlings after the five leaves do: "To fix the spray, do not spray all over the field." Corn 2-5 leaf stage is the best spraying time after weeding. If we miss the best period and weeding is necessary, we should spray the ridges properly and not spray all over the field to avoid phytotoxicity. Otherwise, the light causes yellowing of the heart of the corn, and the leaves of the thicker leaves are whitish and the whole plant stops growing.
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