At present, some herbicides are widely used in rice fields or tobacco fields for weed control, especially in paddy fields. Some farmers tend to use high concentrations of herbicides. If the next season, the residual herbicides often cause phytotoxicity to tobacco leaves. In addition, the selectivity of herbicides is relatively strong, and the physical and chemical characteristics, action sites, and the principle of action of different varieties are all different. Especially when farmers use them, they do not pay much attention to the dose and drug technology, and they are prone to produce herbicides. Symptoms of phytotoxicity are mainly manifested as: leaf deformity, yellowing, albinism, etc.; some appear to be cauliflower-like, mosaic-like, or rat-tailed; old leaves are scorched and new leaves are normal; growth is stagnant, seedlings are shrivelled, plants are short, Serious death will occur. First, the measures to prevent herbicide harm 1. Accurate selection of herbicide varieties. 2. Proficient in the use of herbicide technology and operating points. 3. Strictly control the dosage and concentration of herbicides. 4. Uniform spray, targeted spray, improve the quality of the application. 5. Do not mix herbicides with other insecticides or fungicides at will. 6. Spray the sprayer immediately after spraying the herbicide. Second, the herbicide remedies for the emergence of phytotoxicity After using herbicides, we must carefully observe the growth of tobacco, when the tobacco growth abnormalities, it is necessary to quickly determine the tobacco disease or herbicide phytotoxicity, if the herbicide caused by phytotoxicity, To analyze the degree of harm caused by phytotoxicity, when the phytotoxicity is serious, only the use of other crops or replanting should be adopted; if the symptoms of phytotoxicity are normal or within the range that can be tolerated in tobacco production, the following measures can be considered for remediation. 1. The timely spraying of Tianda 2116 tobacco-specific type after the occurrence of the injury has an important role in relieving or relieving the herbicide's phytotoxicity. 2. Strengthen agricultural management, irrigation, drainage, loose soil, in order to promote the growth of tobacco and accelerate the degradation of herbicides. 3. Use plant ash or lime or apply plant growth regulators to promote tobacco growth. 4. Apply topdressing fertilizer or foliar fertilizer. Potassium dihydrogen phosphate or Penshibao has certain mitigation effects on the herbicides of some herbicides.
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