Causes of Herbicide Phytotoxicity and How to Prevent It
How can you improve the effectiveness of herbicides applied in corn fields? Farmer friends should carefully choose good herbicide varieties and correctly master the timing and method of application to improve herbicide effectiveness: 1. Timing of use: apply herbicides after harvesting wheat and irrigating the field, because high soil moisture allows the efficacy to fully...
Why does herbicide use cause phytotoxicity? How can it be prevented?The area treated with herbicides and the amount applied increase year by year, saving farmers time in controlling weeds, but due to human factors, improper herbicide application has also brought adverse effects on production.
1. Improper storage and blind misuse. Because herbicides are improperly stored, packaging labels fall off or are corroded and become illegible, and the herbicide is mistakenly applied as an insecticide or fungicide, or is applied without following the herbicide label instructions, causing phytotoxicity. Prevention method: store herbicides properly to prevent packaging labels from falling off; if a label is found to be lost, immediately attach a new label stating the herbicide name and application method.
2. Excessive dosage and too high concentration. The application rate and concentration of herbicides are stricter than those of insecticides and fungicides. Each herbicide has a specified dosage; for example, excessive use of tribenuron-methyl can cause phytotoxicity to wheat. Prevention method: strictly control herbicide dosage and concentration.
3. Improper application method. Once a herbicide is applied improperly, it can cause phytotoxicity. For example, when many herbicides are applied, contact with seeds easily causes phytotoxicity; when spraying herbicides near sensitive crops and in strong wind, a large amount of droplets drift onto sensitive crops and cause phytotoxicity. Prevention method: according to the weeds, herbicide, and environmental conditions, choose different application methods, and master the technical points of safe and efficient herbicide application.
4. Blind mixing of pesticides. Mixing herbicides can improve weed control effectiveness, control diseases, insects, and weeds at the same time, save pesticide use, and has advantages such as saving labor, time, and money. However, if mixed blindly, it not only has no synergistic effect, but instead reduces efficacy and causes phytotoxicity. Prevention method: prohibit arbitrary and indiscriminate mixing of herbicides. Before mixing pesticides, conduct compatibility observation and efficacy and phytotoxicity tests first. According to tests, common varieties that can reduce efficacy and cause phytotoxicity after mixing include: propanil mixed with organophosphorus and carbamate pesticides; quizalofop mixed with bentazone; MCPA mixed with acidic pesticides; and fluazifop mixed with bentazone, all of which can lead to phytotoxicity.
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