The compounding and mixing of pesticides means mixing two or more kinds of pesticides together to prepare a preparation or mixing them before use. At present, compound pesticides are rapidly developed and have many varieties, showing certain superiority and vitality. However, in recent years, in order to sell more pesticides, some pesticide dealers blindly induced farmers to mix and use, resulting in the occurrence of crop phytotoxicity, which caused some unnecessary losses, and also caused some disputes, affecting the stability and unity of society.
1. The mixed pesticides cannot be chemically changed. The chemical structure and chemical properties of the active ingredients of the pesticides are the basis of their biological activities. Therefore, when using the pesticides, special attention should be paid to whether the active ingredients and emulsification properties after mixing change. Because this directly affects the efficacy of the drug. In general, pesticides that fail to decompose alkaline substances cannot be mixed with alkaline pesticides or alkaline substances. Once mixed pesticides are quickly decomposed and failed, organophosphorus and carbamate are sensitive to alkaline substances. Pyrethroids It will also decompose and break under strong alkali. Some varieties are relatively stable under alkaline conditions, but they can only be mixed under weak alkali, and they should not be placed for too long after mixing. In addition, some pesticides will also decompose under acidic conditions, such as organic sulfur, so it is prudent to mix. Some pesticides can also cause phytotoxicity when mixed with metal ion-containing substances. For example, methyl thiophanate and copper ions, 2,4-D and heavy metal ions form a complex reaction and lose activity. Therefore, the mixing of pesticides is not a simple mixing, but to study their chemical structure and properties, to prove the biological effects after mixing through scientific and reasonable tests, to ensure the safety of humans and animals, the environment, to prevent or delay the emergence of resistance to pests.
2. The physical properties of pesticides mixed in the field should be kept constant. When mixing in the field, pay attention to whether the physical properties of different components change. If mixed, stratification, flocculation and precipitation, or suspension rate decrease or even crystallization, so Can not be mixed.
3. After compounding and mixing, the toxicity to human and livestock, poultry and fish, and the damage to natural enemies and other beneficial organisms should be reduced. Some pesticides have improved efficacy after mixing, but the toxicity has also increased. For example, malathion is safe for humans and animals and is easily decomposed by biological enzymes in humans and animals. However, when used in combination with dichlorvos and trichlorfon, dichlorvos and trichlorfon inhibit the activity of the enzyme but produce higher toxicity. Therefore, this situation cannot be mixed.
4. After compounding and mixing, it must have different modes of action and control targets to achieve the effect of expanding the insecticidal spectrum. For example, pesticides are mixed with fungicides, disease prevention and pest control, insecticides and ovicidal agents are mixed, and eggs are treated.
5. The pesticide residue in agricultural and sideline products after compounding and mixing should be lower than that of single pesticide.
6. After compounding and mixing, farmers should reduce the cost of use.
In short, as long as the above points are guaranteed, the pesticide will achieve a multiplier effect after the compounding, and the control effect will be greatly improved.
1. The mixed pesticides cannot be chemically changed. The chemical structure and chemical properties of the active ingredients of the pesticides are the basis of their biological activities. Therefore, when using the pesticides, special attention should be paid to whether the active ingredients and emulsification properties after mixing change. Because this directly affects the efficacy of the drug. In general, pesticides that fail to decompose alkaline substances cannot be mixed with alkaline pesticides or alkaline substances. Once mixed pesticides are quickly decomposed and failed, organophosphorus and carbamate are sensitive to alkaline substances. Pyrethroids It will also decompose and break under strong alkali. Some varieties are relatively stable under alkaline conditions, but they can only be mixed under weak alkali, and they should not be placed for too long after mixing. In addition, some pesticides will also decompose under acidic conditions, such as organic sulfur, so it is prudent to mix. Some pesticides can also cause phytotoxicity when mixed with metal ion-containing substances. For example, methyl thiophanate and copper ions, 2,4-D and heavy metal ions form a complex reaction and lose activity. Therefore, the mixing of pesticides is not a simple mixing, but to study their chemical structure and properties, to prove the biological effects after mixing through scientific and reasonable tests, to ensure the safety of humans and animals, the environment, to prevent or delay the emergence of resistance to pests.
2. The physical properties of pesticides mixed in the field should be kept constant. When mixing in the field, pay attention to whether the physical properties of different components change. If mixed, stratification, flocculation and precipitation, or suspension rate decrease or even crystallization, so Can not be mixed.
3. After compounding and mixing, the toxicity to human and livestock, poultry and fish, and the damage to natural enemies and other beneficial organisms should be reduced. Some pesticides have improved efficacy after mixing, but the toxicity has also increased. For example, malathion is safe for humans and animals and is easily decomposed by biological enzymes in humans and animals. However, when used in combination with dichlorvos and trichlorfon, dichlorvos and trichlorfon inhibit the activity of the enzyme but produce higher toxicity. Therefore, this situation cannot be mixed.
4. After compounding and mixing, it must have different modes of action and control targets to achieve the effect of expanding the insecticidal spectrum. For example, pesticides are mixed with fungicides, disease prevention and pest control, insecticides and ovicidal agents are mixed, and eggs are treated.
5. The pesticide residue in agricultural and sideline products after compounding and mixing should be lower than that of single pesticide.
6. After compounding and mixing, farmers should reduce the cost of use.
In short, as long as the above points are guaranteed, the pesticide will achieve a multiplier effect after the compounding, and the control effect will be greatly improved.
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