Which pesticides cannot be mixed? A detailed explanation of pesticide mixing taboos
Pesticides are a very important substance in our planting and production. Because crops are prone to developing some diseases during their growth, rational use of pesticides can effectively prevent and control them. And some pesticides can greatly help with crop yield and quality. However, when we use pesticides, some pesticides cannot be mixed. So which pesticides cannot be mixed? Let's take a look together with the editor below!
1. Producing chemical reactions
When we mix pesticides, we must first clearly understand whether a chemical reaction will occur after mixing. For example, Bordeaux mixture and lime sulfur mixture: if these two pesticides are applied separately, their disease prevention and control effects are very good. But if they are mixed together, a chemical reaction will occur. A precipitate of copper sulfide appears, which will not only cause both agents to lose their efficacy, but the copper sulfide will also form copper ions. This causes crops to drop leaves and fruit, and the leaves and fruit are also easily burned, resulting in serious pesticide damage. Therefore, after spraying Bordeaux mixture, about one month should pass before lime sulfur mixture can be sprayed.
2. Acidic and alkaline pesticides
The pesticide types commonly used on the market today are generally divided into three categories: acidic, alkaline, and neutral. For example, sodium fluorosilicate and lead arsenate are neutral pesticides, while copper sulfate and superphosphate are acidic pesticides. In addition, commonly seen pesticides such as lime sulfur mixture and Bordeaux mixture are alkaline pesticides. If acidic and alkaline pesticides are mixed, they will decompose each other, thereby destroying the pesticide components, causing reduced efficacy, and in severe cases even causing pesticide damage. When spreading lime or plant ash, organic phosphorus insecticides such as fenitrothion and some microbial pesticides cannot be used either.
3. Destroying emulsions after mixing
After many pesticides are mixed together, the emulsions in the pesticides are very easily destroyed, and pesticides that destroy emulsions after mixing are also unsuitable for use. For some calcium-containing pesticides such as lime sulfur mixture, when spraying, note that they cannot be used together with emulsion pesticides, nor can soap be added. Because when emulsifiable concentrates and substances such as soap encounter calcium, a chemical reaction is also very likely to occur, producing a calcium soap precipitate, causing the emulsion to be destroyed, reduced efficacy, and even pesticide damage.
4. Fungicides and microbial pesticides
When using pesticides, many people have a misunderstanding: when using fungicides, they apply microbial pesticides together. In fact, these two types of pesticides also cannot be mixed. Because the main effect of fungicides is to eliminate bacteria and various other microorganisms. Microbial pesticides are mainly based on microorganisms, so fungicides will act on the microorganisms in microbial pesticides. If mixed together, the microorganisms in the microbial pesticides will be killed, causing the microbial pesticides to lose their efficacy.
The above is a brief introduction to what pesticides cannot be mixed. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!