Maize 3-5 leaf stage. Corn 3-5 leaf stage is an important period for weed control in corn fields. If weeds are not controlled in time, it will directly affect the growth and yield of corn. Postemergence shoot treatment may be applied at the corn 3-5 leaf stage. When applying pesticides, it is necessary to pay attention to the application of corn at the 5th leaf stage. After the 5th leaf stage of the corn, the pesticide is prone to phytotoxicity. When the pesticide is applied, it is prone to phytotoxicity in case of high temperature.
For long-term application of acetochlor and other closed herbicides in corn fields, in the corn 3-5 leaf stage, field aconite, glutinous rice dumplings occur in large numbers, you can use nicosulfuron or sulfosulfuron and other post-emergence shoots Treatment agent evenly sprayed. When the application of pesticides is not uniform or the drug amount is large, the corn leaves have a small amount of yellow spots and can be recovered in a short period of time, and generally do not affect the growth and yield of corn. 6-8 leaf stage of corn. For the plots that had not been subjected to chemical weeding, poor lye, and less weeds in the field in the earlier period, herbicides with both herbicidal and sealing effects could be sprayed on the 6-8 leaf stage of maize and the 50 cm plant height of maize. Remove the weeds that have emerged in the field, and then we can close and no longer produce grass. For example, nicosulfuron plus tetrazine can be used for targeted spraying of water. When applying pesticides, windless weather should be selected. When spraying in a directed manner, it is necessary not to spray the liquid into corn horns. Otherwise, it is prone to phytotoxicity. For the early stage of chemical weeding, the field where a large number of weeds occurred in the fields after raining or flooding can also be sprayed with Nicosulfuron plus azithromycin. For the early application of the closed herbicide failed to control the field of Aconite, the Aconite is basically all emerged, and the Aconite is in the seedling stage, which is a favorable period for control. The water can be sprayed with stems and leaves using dimethyltetrachloro-sodium salt. Spraying should be sprayed on the stems and leaves of Perfurpium oxysporum, spraying as much as possible. During the application period, it is better to use corn in the 5-6 leaf stage, and it should not be too early or too late, otherwise it is prone to phytotoxicity.
The application temperature is too high (35 °C), and it is also prone to phytotoxicity to corn. Corn 8 leaf stage. In the middle stage of corn growth, the fields that failed to control the weeds in the early stage without chemical weeding or poor pesticide application could be after the 8th leaf stage of maize, the maize plant height exceeds 60 cm, and the base of the corn stem becomes purple after aging. Direct spray on water with paraquat. When the spraying is applied, windless weather should be selected. When direct spraying, it is necessary not to spray the liquid onto corn stems and leaves. Otherwise, it is prone to phytotoxicity.
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