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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 dosage is too much and the concentration is too large. The application amount and concentration of the herbicide are more strict than the insecticide and the bactericide. 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.
4. Blindly mix pesticides. The herbicide mixture can improve the herbicidal effect, 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; mixed with grass and bentazone; mixed with metformin and acidic pesticides; Stabilizing and mixing with bentazon can cause phytotoxicity.
Herbicide phytotoxicity generation and prevention
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.
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