In recent years, the application area and application rate of herbicides have increased year by year, saving farmers time for weeding and weeding. However, due to human factors, improper application of herbicides has also adversely affected production and should be noted.
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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 applied 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, indicating the name of the herbicide and the method of application.
2, the herbicide used in different varieties of different crop herbicides, the sensitivity of crops is not the same, such as grass can, grass, stable, etc., to control the broad-leaved crops in the field of grasses However, the phytotoxicity of wheat, millet and corn in grass crops is serious or even death, resulting in serious production reduction or production. Prevention method: According to the type of crops, the herbicide is selected correctly to prevent the herbicide from being used in sensitive crops. In order to avoid phytotoxicity. For example, cotton, melon, soybean, peanut and other dicotyledon crops are extremely sensitive to herbicides such as dimethyltetrachloride and 2,4-D ester; wheat, millet and other grass crops are sensitive to grass cover and stable killing. It is easy to cause phytotoxicity.
3. Use of herbicides during the sensitive growth period of crops Crops are sensitive to herbicides at different stages of growth and development. The sensitive period of general crops is the bud stage and the heading and flowering stage. During this period, the herbicide is used, which is easy to cause diseases. For example, if 24-D-butyl ester is sprayed before and after jointing of wheat 3 to the flowering stage, the phytotoxicity is characterized by wheat ears and leaves twisted, and abnormal ears or unextracted ears appear. Prevention method: When using herbicides, pay attention to avoiding the sensitive period of crops, so as not to cause phytotoxicity.
4, too much drug use, excessive concentration of herbicide application and concentration, more stringent than pesticides, fungicides, each herbicide has a prescribed amount, for example, the amount of superstars is too large, can produce wheat Drug damage. Prevention method: Strictly control the amount and concentration of herbicides.
5, improper medication methods Herbicide once applied improperly, it will cause phytotoxicity. For example, when many herbicides are applied, they are contaminated with seeds, which may cause phytotoxicity; when herbicides are sprayed in the vicinity of sensitive crops and high winds, a large number of mists drift on sensitive crops to cause phytotoxicity. For example, the use of 24-D butyl ester herbicide in the corn field drifted to the cotton mountain caused damage to cotton, and even production. Prevention methods: According to weeds, herbicides and 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.
6. Blind use of pesticides Herbicides can improve the effect of herbicides, expand the spectrum of killing grass, cure diseases, insects and grasses, thus saving labor, time and cost. 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 first mixed observation, efficacy, and phytotoxicity experiments. 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 herbicides; grass and bentazon Mixed use; mixed with dimethyl tetrachloride and acidic pesticides; stable use of mixed with bentazon can cause phytotoxicity.
7. The sprayer is not clean. Spraying the herbicide sprayer, if it is not cleaned in time, spray other pesticides, which can cause phytotoxicity. If sprayed with dimethyl cyhalothrin and 2,4-D butyl ester, the cleaning is not clean, which may cause phytotoxicity of the dicotyledonous crop. Prevention method: Spray the sprayer with herbicide first, rinse it with water first, then wash it several times with soap or 2%-3% alkaline water, and then rinse it with water. It is best to use a sprayer to spray the herbicide.
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