Many people have used pesticides , and some people often use pesticides, but do you know about pesticides? Do you know the systemic, permeability and conductivity of pesticides? The following is a small series to explain the systemic, permeability and conduction of pesticides. Sex.
The systemicity of pesticides generally means that the drugs can be absorbed by the crops and transmitted in the body to achieve the purpose of controlling pests and diseases. For example, tricyclazole has good systemic properties and is quickly absorbed by rice after application (applicable in 1-2 hours, so it can be applied in the rain gap), and is transmitted in the body, into the surface layer of rice leaves, tissue The germination and immersion of the rice blast spores, and the drug has a weak inhibitory effect on the isolated rice blast pathogen. Because of the good systemicity, pesticides such as imidacloprid have good control effect on brown planthoppers, which are mainly active in the base of rice plants, and are superior to other insecticides with only contact killing properties. But it is not that the drug is strong enough to be effective, and it needs to be highly active. Acephate has a strong systemic property, but its activity on rice planthopper is not too high. After application, it has only a certain contact effect on rice planthopper. The drug entering the rice plant is low in concentration and is suitable for rice. There are not many control effects in the flying raft. In recent years, the brown planthopper has developed resistance to imidacloprid, and the activity of imidacloprid against brown planthopper has decreased, and the control effect after application has decreased.
The systemicity of herbicides is mainly for the control of weeds. For example, glyphosate and flufenoxyacetic acid have good systemic properties, which are good for killing weeds; roots are not systemic, and only the upper part of the grass that is sprayed into the medicine can be killed. Of course, drugs such as flufenoxyacetic acid and sodium chlorochloride, which are systemic, can also enter the crops, but under normal conditions of use, crops such as rice and wheat can make these drugs into the body ineffective or It plays a lesser role and is therefore relatively safe for the crop itself.
Abamectin, emamectin benzoate and other drugs, after spraying on the crop, can not be sucked by the crop, but the drug can penetrate under the epidermis of the leaf and form a small drug pack, which lasts longer. The efficacy of the drug. When spraying this kind of medicine, it is advisable to add enough water to spray the whole plant to improve the protective effect, sufficient water volume and spraying in the evening, and avoiding the liquid medicine to dry too quickly, which is beneficial to the penetration of the medicine into the crop body.
More pesticide knowledge , please pay attention to China Pesticide Network
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