Human causes and prevention of herbicide phytotoxicity

In recent years, the application area and application rate of herbicides have increased year by year, saving farmers time for weeding and weeding, but due to human factors, improper application of herbicides has also adversely affected production.
1. Improper storage, blind misuse. Due to improper storage of the herbicide, the label of the package is detached or the label is corroded. It is not clear that the herbicide is used as an insecticide or a bactericide, or is not applied according to the label of the herbicide, causing phytotoxicity. Prevention method: Keep the herbicide properly and prevent the packaging label from falling off. If the label is found to be missing, a new label should be attached immediately to indicate the name of the herbicide and the method of application.
2, the amount of medication is too much, the concentration is too large. The application amount and concentration of herbicides are more strict than insecticides and fungicides. Each herbicide has a prescribed amount. For example, if the amount of superstar is too large, it can cause phytotoxicity to wheat. Prevention method: Strictly control the amount and concentration of herbicides.
3. Improper medication. Once the herbicide is applied improperly, it will cause phytotoxicity. For example, when many herbicides are applied to the seeds, they are susceptible to phytotoxicity; in the case of sensitive crops and high winds, the herbicides are sprayed, and a large amount of dew drops drift on the sensitive crops to cause phytotoxicity. Prevention methods: According to weeds, herbicides, environmental conditions, choose different application methods, and master the technical points of safe and efficient application of herbicides. Improve the quality of application, clear the herbicide to the weeds, make the time of the drug accurate, choose to apply on sunny days without wind, avoid contaminating the sensitive parts of crops or drift to nearby sensitive crops.
4. Blindly mix pesticides. The herbicide mixture can improve the herbicidal effect, expand the herbicidal spectrum, treat diseases, insects and grasses, save medicine, and has the advantages of labor saving, time saving and money saving. However, if blindly mixed, it will not only have no synergistic effect, but will reduce the efficacy and cause phytotoxicity. Prevention method: It is forbidden to use the herbicide. Mixed pesticides should be mixed, observed, tested for efficacy and phytotoxicity. According to the test, the common varieties that can reduce the efficacy after mixing, and the occurrence of phytotoxicity are: propanil and organophosphorus, carbamate pesticides; 2,4-D and chlorpyrifos; grass and bentazon Mixed use; mixed with dimethyl tetrachloride and acidic pesticides; stable use of mixed with bentazon can cause phytotoxicity.
5, the sprayer is not clean. For sprayers that have used herbicides, if they are not cleaned in time, and then spray other pesticides, it may cause phytotoxicity. If sprayed with dimethyltetrachloride and 2,4-D butyl ester, the cleaning is not clean, which is easy to cause medicinal damage of the dicotyledonous crop. Prevention method: The sprayer that has used the herbicide should be cleaned in time. The procedure is to rinse with water first, then wash it several times with soap or 2%-3% alkaline water, and finally rinse it with water. It is best to use a sprayer to spray the herbicide.

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