The proper use of pesticides can not only save pesticides and reduce costs, but also improve the control effect, reduce drug residues, effectively control the damage of diseases, insects and weeds, and ensure the normal growth of crops. So when is the pesticide applied better? How to determine the time of pesticide application? When is it effective For pests, the peak period of pests can be the peak period of egg hatching, larval period, and adult period. After all, in which period is the most effective control effect of medicines, depending on the specific situation. In principle, it is necessary to control the living habits of pests, at the stage where they are most likely to kill the pests and effectively control the damage. For example, to control mythimna separata, spraying pesticides during the peak period of egg mass hatching has good control effect on the hatched larvae, but it may not be effective for the later hatched larvae. When the larvae are at the peak of 2 to 3 instars, spray the pesticide for one control You can solve the problem of pests. How to determine the time of pesticide application ◠The body wall of the pests is very thin before the third instar, and there are many micro hairs on the body wall. The epidermis of the micro hairs is very thin, and the agent can easily pass through this layer. The body is small, the food intake is large, the damage is light, the area of ​​activity is small, and the resistance (drug resistance) is weak. Therefore, to determine the appropriate period of pest control, it is necessary to control the use of the drug before the peak period of 2 ~ 3 years old, and some should be controlled to hatch in the egg mass. The best prevention and treatment effect can be achieved by using the medicine before and after the peak period. ◠The amount of fat in the body of the worms has also increased during the age of the worm, and it has the function of backlogging and decomposing many pesticides. The higher the fat content of the pest, the more obvious this effect and the stronger the resistance (resistance). ◠Sensitive period of natural enemies In the period when the natural enemies of the pests are more sensitive to the drug, they should use as little or no medicine as possible to protect the natural enemies and maintain the ecological balance in the field. ◠Sustainable fertility period For the disease, the fertile period of susceptibility to disease is the best suitable period for drug control. If the seedling stage is the most susceptible to stand blight, it can be mixed with fungicide before sowing or sprayed at seedling stage. In another example, the flowering period is also the peak period of disease infestation. Therefore, it is necessary to control the prevention and prevention of road drugs during the flowering period to control the occurrence and spread of diseases. ◠The application of herbicides in the sensitive period of weeds should generally be used in the period of sensitive periods of weeds. For weeds infested with seeds, the germination stage and seedling stage are more sensitive to herbicides. Therefore, this period is often the appropriate period for herbicide application. It is usually better to control before sowing seedlings or 1-2 leaf stage of weeds. When using broad-spectrum biocidal herbicides, such as Kewufan, glyphosate, and Roundup, etc., they should be used when the weeds are relatively sensitive during the growing period. The herbicidal effect is obvious and the potency is long. If controlling weeds in farmland in spring and summer, it is best to spray the herbicide in the early stage of weeds. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone Jiangsu Tiera Biotechnology Co., Ltd , https://www.tierabio.com