What should be paid attention to when mixing copper-containing fungicides

Everyone knows that pesticide mixing has the advantages of saving labor and time, and the advantages of one spray can prevent and cure a variety of pests and diseases, which is very attractive to vegetable farmers. So can copper-containing fungicides be mixed? What are the requirements for mixing copper-containing fungicides?

Can copper-containing fungicides be mixed?

Because copper preparations have a good effect on bacterial diseases, if the fungicides and oomycetes can be properly mixed, the bacteria, fungal diseases and oomycetes can be controlled at the same time. However, copper preparations are most likely to cause phytotoxicity. Mixed use further increases the possibility of phytotoxicity. Therefore, it is necessary to pay attention to many contraindications in the mixing of copper preparations. In addition to not being used for sensitive crops, it should be noted that under normal circumstances, "Metal" pesticides are mixed. If it cannot be mixed with drugs such as mancozeb, dexamethasone, thiram and other ingredients, it cannot be mixed with foliar fertilizer containing "metal". Metal ions can cause sedimentation of suspensions and suspensions, which can change the efficacy or cause phytotoxicity. Because the copper ions themselves and the metal ions in various pesticides may also cause this reaction, this makes the copper preparations more complicated in the mixed use, and it is more difficult to predict whether or not the chemicals are harmful. Get more agricultural information, plant protection technology, agricultural marketing story, please Baidu micro-agriculture. In addition, most copper preparations cannot be mixed with thiophanate-methyl (methyl thiophanate), carbendazim, and pesticides containing carbendazim. Therefore, when the situation is unknown, a preliminary test should be done, that is, mixing first to see if there is any change in color, bubble generation, precipitation, or colloidal suspension change, chemical reaction phenomenon such as drug moisture layer, once these phenomena occur Can not be mixed. Or you can test it on the vegetables first, and then use it in large areas when there is no phytotoxicity.

Precautions for mixing copper-containing fungicides

Some copper preparations are mixed to cause phytotoxicity

Copper preparations have good control effect on bacterial diseases, but the copper ions in them easily cause sedimentation of suspensions and suspensions, which may cause changes in drug efficacy or cause phytotoxicity. Therefore, in addition to the copper preparations can not be used for sensitive crops, there are still many contraindications in the mixed use. If it cannot be mixed with drugs such as mancozeb, sensitized zinc, thiram and other metal components, it cannot be mixed with metal-containing foliar fertilizer. In addition, most copper preparations cannot be mixed with thiophanate-methyl (methyl thiophanate), carbendazim, and pesticides containing carbendazim.

Therefore, when the situation is unknown, preliminary tests should be done, that is, a small amount of mixing should be carried out to see if there is a chemical reaction phenomenon such as changing color, generating bubbles, generating precipitation, or changing the colloidal suspension to cause a drug moisture layer. Mixed. Or, after mixing, first spray a small area on the vegetables, and then spray a large area when there is no phytotoxicity.

Some copper preparations have a stronger effect

Different from simple artificial mixing, those produced by the factory complex copper preparation pesticides, such as copper (potassium hydroxide), manganese complexed with mancozeb, have a good sterilization effect, and can be used in the same range. Mix organic bactericides such as chlorothalonil and chlorpyrifos.

More pesticide knowledge , please pay attention to China Pesticide Network

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