Bactericides of copper preparations have two outstanding advantages: -① It kills and controls bacterial diseases and fungal diseases on crops at the same time; ② It is cheap, has a wide range of use, has many types of diseases, has low toxicity of drugs, is good in bactericidal and curative effects, and is not easy to develop drug resistance. However, copper preparations also have a very big disadvantage. - if the copper preparation is used improperly (incorrect use period, excessive dosage concentration, improper selection of compound drugs or used on crops sensitive to copper preparations, etc.), it is very easy to cause drug damage in crops. In this regard, organic copper bacterial fungicides are not prone to drug damage, and inorganic copper bacterial fungicides are most likely to cause drug damage.
But then again, any product has both advantages and disadvantages, and there is no 100% perfect product on the market. Therefore, for copper preparations, we only need to understand its "nature", its "characteristics", and master its "usage skills", and achieve outstanding results in the prevention and control of crop diseases that cost less, have good results and are harmless in the prevention and control of crop diseases.
OK, without saying much nonsense, today I will tell you a comprehensive discussion on the characteristics and usage techniques of copper preparation fungicide (I have summarized 12 items for you)!
Article 1 (understand) : The product names of copper preparations and bactericides all contain the word "copper", and the drug ingredients of the product contain " copper ion ". These bactericides also have the effect of bactericidal and curing diseases through the "watery copper ions" released from the drug solution.
Article 2 (remember) : Copper preparation fungicides can simultaneously prevent and control bacterial diseases and fungal diseases on field crops. When crops are comprehensively affected or multiple diseases need to be prevented and treated at the same time, the use of copper preparation fungicides can achieve the effect of "one medicine and multiple treatments". This can not only reduce the investment in purchasing multiple fungicides, but also reduce the number of times you spray medicine and the trouble of multiple injections. However, when using copper preparations, the flowering and young fruiting periods of crops should be avoided.
Article 3 (understanding) : Copper preparations and bactericides are mainly divided into two categories: bactericides of organic copper preparations (copper ions are organic compounds) and bactericides of inorganic copper preparations (copper ions are inorganic compound ). Simply put, the bactericides that combine "copper ions" with organic groups in pesticides are organic copper preparations (copper ions are unstable release), and the bactericides that combine "copper ions" with inorganic ions are bactericides of inorganic copper preparations (copper ions are unstable release). In addition, organic copper molecules contain carbon-copper bond structures, and inorganic copper preparations do not contain carbon-copper bond structures; organic copper ions in organic copper preparations can be directly absorbed and utilized by crops, while inorganic copper ions in inorganic copper preparations cannot be directly absorbed and utilized by crops.
Article 4 (remember) : Common organic copper preparation fungicides on the market mainly include quinoline copper, copper acetate , nylon copper, thiamin copper , thiamin copper, rosine copper , thiamin copper, gram copper, amino acid copper, copper humate copper, etc., and the common inorganic copper preparation fungicides on the market mainly include Bordeaux liquid (also called "copper sulfate calcium"), copper oxychloride (also called " king copper "), copper hydroxide, cuprous oxide , basic copper sulfate , etc.
Article 5 (Remember) : The most common organic copper preparations are generally neutral (except for alkaline copper), while the most common inorganic copper preparations are generally strongly alkaline (the alkaline pesticides we usually refer to mainly pesticides for inorganic copper preparations).Because most of the pesticides and fungicides on the market are weakly acidic and only a few pesticides are alkaline, from this point of view, the fungicides of organic copper preparations have a wider mixing and useability with other pesticides. Because the fungicides of inorganic copper preparations are alkaline, they generally cannot be mixed with most pesticides on the market (mainly, the alkali will undergo a neutralization reaction when encountering acid, which makes the liquid ineffective).
Article 6 (Remember) : When copper preparations are used on field crops, they should try to avoid compounding with pesticides and foliar fertilizers containing metal ions (such as foliar fertilizers and pesticides containing potassium, zinc, iron, manganese, calcium, molybdenum, zinc, magnesium, aluminum, sodium, etc.). Especially when using inorganic copper preparations, you must remember to use them alone. You must not mix them with any other pesticides and foliar fertilizers (especially fertilizers containing the above metal ions), otherwise it is very easy to cause drug damage to the crop or change the efficacy/fertilization effect. Even if pesticides using organic copper preparations are combined, as long as bubbles, stratification, flocculation, precipitation, turbidity occur during the compounding liquid (which indicates that adverse reactions occur in the compounding liquid), the preparation and use of the drug solution should be stopped immediately, otherwise such a drug solution is very likely to cause unknown drug damage to the crop.
Article 7 (Remember) : When copper preparation fungicide is used on field crops, it is not only not allowed to be mixed with pesticides and foliar fertilizers containing the above metal ions, but also everyone should be careful not to mix copper preparation fungicides with foliar fertilizers such as chitin , alginic acid , amino acid , humic acid, etc. Otherwise, after these small and medium-sized foliar materials encounter copper ions in copper preparations, they will easily cause irritating drug damage to crops, leaves, flowers, fruits, etc.
Article 8 (Remember) : The incidence of drug damage and environmental pollution of organic copper preparations and inorganic copper preparations is different, which is mainly related to the copper ion structure and copper content contained in the two copper preparations. The copper content in organic copper preparations is low and belongs to organic copper compounds that can be directly absorbed by crops (chelated organic copper has better effect), so organic copper drugs are not likely to cause drug damage to crops or cause heavy metal pollution to the environment. The copper content in inorganic copper preparations is high and belongs to inorganic copper compounds (inorganic heavy metal copper ions) that cannot be directly absorbed by crops. Therefore, inorganic copper drugs are easy to cause drug damage to crops and also easily cause greater harm to the environment for heavy metal residue pollution. Generally, pesticides of inorganic copper preparations need to be used separately (not combined with other pesticides).
Article 9 (Remember) : After copper preparations are used on crops (especially on crops such as fruit trees), inorganic copper preparations will easily stimulate or cause mites (such as red spider), whitefly pests (such as rust tick ), scale insects and other pests are proliferated and become out of control (because inorganic copper fungicides will kill the natural enemies of the above-mentioned pests), while organic copper preparations will not cause mites (such as red spider), whitefly pests (such as rust tick), scale insects and other pests will lose control (because organic copper fungicides will basically not harm the natural enemies of the above-mentioned pests).
Article 10 (Remember) : After copper preparations are used on crops, organic copper fungicides are more friendly to crops and have less harmful effects on crops (for example, it is not easy to cause damage to leaves, flowers, fruits, and fruits, and it is not easy to cause pollution to leaves and fruits). Inorganic copper fungicides are not very friendly to crops and can easily cause harm to crops (for example, it causes harm to flowers, fruits, and fruits, resulting in large quantities of fallen flowers, fruits, or tender leaves, such as contamination of leaves and fruits. This is also the main reason why many farmers say that copper preparations are bad, because most crops are damaged due to improper use of inorganic copper pesticides).
Article 11 (Remember) : Bactericides for copper preparations (especially organic copper preparations with higher safety) can be used on most crops (it is recommended to avoid the tender leaf stage, bud stage, flowering stage, young fruit stage, and coloring stage of the crop as much as possible), but it is not suitable for use on all crops. Generally speaking, it includes peach trees, pear trees, apricot trees, and plum trees. Fruit trees including subtree , mango tree , lychee tree, persimmon tree, cherry tree, kiwi tree , etc. (if the medicine technology is relatively high, it should be used at low concentrations) and various crops in the young seedling stage, these crops and crops are very sensitive to the copper ions in the copper preparations and are very prone to drug damage. Therefore, it is not recommended to use copper preparations in the several crops listed above and in the young seedling stage, including organic copper preparations.
Article 12 (Remember) : Several situations in which copper preparations are most likely to cause crop damage - ① Use copper preparations in the young and tender parts of crops, as well as copper ion-sensitive crops (especially the flowering and fruiting periods of crops); ② The concentration of copper preparations in high weather temperatures is too large (water evaporation too fast causes the total amount of medicine absorbed by crops); ③ Use copper preparations when the weather is too large (the liquid does not dry on the surface of the crop for a long time, resulting in the amount of medicine absorbed by crops); ④ Improper use of copper preparations with other fungicides, insecticides, and foliar fertilizers.
Finally, the agricultural technology backpack will give you two additional items -
In terms of bactericidal and curative effects of copper preparation fungicides and causes of drug damage (understand): After the copper preparation liquid is sprayed onto the surface of the crop, after the copper ions in the medicine liquid are released, if the copper ions in the medicine liquid bind to the protein group of the pathogen, it can inhibit the synthesis of key proteins in the pathogen, inhibit the activity of multiple enzymes in the pathogen, and then play an antibacterial and bactericidal effect on field crops; if the copper ions in the medicine liquid combine with the organic acid on the leaf or young fruit surface, it is very likely to cause drug damage to the crop.
Whether the copper preparation plays a bactericidal and curative effect or causes crop disease damage after use, it mainly depends on whether the unstable copper ions in the copper preparation solution are released with bacterial proteins or combined with organic acids on the surface of the crop. Deciding whether the antibacterial and sterilization of copper preparations mainly depends on the release concentration of watery copper ions in the medicine solution. When the continuous release concentration of copper ions is greater than 1PPM and less than 10PPM, the copper preparation can play a better bactericidal and curative effect without causing drug damage. When the continuous release concentration of copper ions is greater than 10PPM and less than 10PPM, the copper preparation can easily cause crop damage.
in terms of the diseases and optimal use period of copper preparation fungicide prevention and control (remember): copper preparations generally have good effects on all kinds of fungal and bacterial diseases on crops (before the crop starts), especially in the prevention and treatment of rust, powdery mildew, gray mold , downy mildew , round-trick disease , umbilical disease, ulcer disease, scab disease, , swelling disease, etc. In addition, everyone should also remember that copper preparations are essentially preventive fungicides, and are generally best used before the peak of crop disease or at the beginning of crop disease.
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