Be aware of these alkaline pesticides!
We often see the words “cannot be mixed with alkaline pesticides†in the pesticide description. So what are the basic pesticides?
Alkaline pesticides are acidic or alkaline depending on whether the pesticide is acidic, and pH is less than 7 is acidic, and greater than 7 is alkaline. In the mixed use of pesticides, chemical changes often occur, resulting in reduced or invalid efficacy. Therefore, attention should be paid to the acid-alkaline-sensitive agents to achieve reasonable mixing.
First, commonly used alkaline pesticides
1. Bole multi-liquid: It is a sky blue suspension made of copper sulfate, quicklime and water. It is a protective agent.
2, rosin mixture (pinene mixture): is a strong alkaline rosin soap solution made of rosin and caustic soda (sodium hydroxide) or alkaline surface (sodium carbonate).
3, stone sulfur mixture (lime sulfur mixture): is made of lime, sulfur and water. Strongly alkaline. It has a killing and bactericidal effect.
4. Sodium pentachlorophenol: its aqueous solution is alkaline. It is a contact-killing herbicide.
2. Pesticides that are easily decomposed by alkali
1, organic phosphorus preparations: such as dichlorvos, trichlorfon and so on.
2, organic nitrogen pesticides : some organic nitrogen pesticides are unstable, such as carbofuran.
3, pyrethroid insecticides: such as enemy killing, killing pyrethroids.
4, acaricide: such as dicofol.
5, fungicides : Some fungicides are unstable in the case of alkali, such as: rice bran, tobuzin, dikesong and so on.
At present, pesticides commonly used to control crop pests and diseases are generally not mixed with alkaline pesticides, but they can basically be mixed.
Third, pesticide mixing precautions
1. Pesticides with reduced efficacy after mixing cannot be mixed.
Many insecticides and fungicides are mixed with alkaline substances to easily decompose or reduce the efficacy, such as organophosphorus, carbamate, pyrethroid insecticides and disulfide carbamate derivative fungicides (Fumeishuang, Pesticide zinc, mancozeb, etc.) will decompose under alkaline conditions and cannot be mixed with alkaline pesticides. These agents should not be mixed with alkaline stone sulphur and Bordeaux mixture, but the acaricide Nisola has the same ability. The advantages of mixing alkaline agents are not listed. Most organic sulfur fungicides are sensitive to acidic reactions and should be used with caution. For example, double-effect spirit (ie, amino acid copper) will resolve copper ions in the presence of acid, which not only reduces the efficacy, but also easily causes phytotoxicity. Some pesticides cannot be mixed with metal ion-containing drugs. For example, methyl thiophanate or disulfide carbamate fungicides should not be mixed with copper preparations.
2. It is easy to mix medicinal damage after mixing.
Stone sulphur mixture and Bordeaux mixture, dithiocarbamate fungicide and copper preparation mixed, thiram, Daisen ring fungicide and alkaline drugs mixed, will produce serious phytotoxic substances to crops, so can not Mixed.
3. Pesticides with cross-resistance should not be mixed
For example, the fungicide carbendazim and methyl thiophanate have cross-resistance. Mixing not only does not delay the development of resistance to pathogens, but accelerates the development of drug resistance, so it cannot be mixed.
4, the physical properties change after mixing can not be mixed
When mixing pesticides, pay attention to whether the physical properties of different components are changed. After mixing, delamination, flocculation and precipitation, emulsion destruction, suspension rate reduction, and even crystallization may not be mixed. When the emulsifiable oil and the water agent are mixed, the liquid medicine liquid can be first dispensed, and the emulsifiable liquid liquid is prepared by using the liquid medicine liquid. Some aquatic pesticides that are acidic and contain a large amount of inorganic salts may be demulsified when mixed with emulsifiable pesticides, and mixing is prohibited. When the organic phosphorus wettable powder is mixed with other wettable powders, the suspension rate will decrease, which may easily cause phytotoxicity and should not be mixed.
Whether pesticides can be mixed, first, carefully read the instructions of pesticides, fully understand the traits and characteristics of various pesticides; second, consult the pesticide compounding table to determine whether it can be mixed; third, when the two pesticides are mixed for the first time. You can do the mixing test first. A small amount of two kinds of chemicals were mixed in a transparent glass container, and it was observed carefully whether abnormalities such as sedimentation, oil slick, discoloration, and heat generation occurred. As long as physical or chemical changes occur in the liquid, the two agents cannot be mixed. Fourth, the feasibility is proved by a small amount of mixing test. A small amount of pesticide with a slightly higher concentration can be mixed for small-area field test or single crop drug. In the case of the damage test, the mixed test agent can be used for field production without observing the test results.
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