The rational use of pesticides not only saves time and effort, but also can prevent and cure a variety of diseases, pests and weeds at the same time. It also has the advantages of reducing dosage, improving control efficiency, and delaying resistance. However, there are many people who are blindly involved in production, and the advantages of mixed use are not reflected, but they are counterproductive, resulting in reduced efficacy or even failure, and may also cause phytotoxicity to crops. Therefore, the mixing of pesticides must be scientific, and only reasonable mixing can achieve good results. In general, the following principles should be observed in the mixture of pesticides:
One or two mixed pesticides cannot be chemically altered. If you encounter alkaline substances that are easily decomposed and ineffective, do not mix them with alkaline pesticides. Dimethoate, dichlorvos, malathion, etc. cannot be mixed with alkaline pesticides such as lime sulfur and Bordeaux mixture, otherwise it will cause decomposition, degradation and failure.
Second, the physical properties of mixed pesticides should remain unchanged. Mixed precipitation can not be mixed, such as Bordeaux mixture can not be mixed with lime sulfur, otherwise it will produce copper sulfide precipitation, and then produce crop injury.
Third, the use of different pesticides should not increase the toxicity to humans, livestock, poultry and fish as well as harm to other beneficial organisms and natural enemies.
Fourth, the mixing of pesticides should be reasonable. Such as control of soybean field grass weeds, get caught net, cover grass can prevent both the use of both, although no adverse effects, but neither increase efficiency, nor expand the scope of control, so there is no need to mix.
Fifth, different kinds of pesticides are used together to achieve the purpose of synergies in efficacy, and no antagonistic effects can be expected. If Bendarson is used together with the net, it will reduce the control effect of grass weeds due to antagonism.
6. After mixing, pesticide residues in agricultural and sideline products should be lower than those used alone.
Seven, pesticides should be mixed to help reduce costs. Mixing pesticides is to save time and labor, reduce consumption, and increase economic efficiency. If the cost increases after mixing, the principle of mixing pesticides will be violated.