The concentration of the drug solution has a direct relationship with the effect of controlling tobacco and Cordyceps. In general, if the concentration of commercial pesticides is high, the efficacy is relatively better. However, if the concentration is too high and exceeds a certain limit, the effect of the drug does not increase proportionally with the increase in concentration. Excessive application concentration, in addition to causing waste of chemicals and increasing agricultural production costs, is more serious, it will also kill a large number of natural enemies of pests and diseases, leading to increased resistance to pests and diseases and environmental pollution. At the same time, because tobacco itself has exceeded the highest tolerance level for pesticides, it is very easy to harm tobacco and cause phytotoxicity, causing huge losses to farmers. If the dilution factor of the pesticide is too large, the concentration of the agent is too low, which is lower than the dose required to prevent tobacco pests and diseases, and it does not achieve the purpose of killing harmful organisms. It is also a waste of labor and medicine, and it is also missed. Prevention and control of the disease will cause a large loss of pests and diseases. In addition, if the concentration of the drug used is correct, but the amount of the drug used per unit area is too large or too small, the same effect as the concentration of the drug used is too high or too low. Therefore, accurately using the concentration of the drug and applying the appropriate amount of drug is the key to improving the control effect of the drug, and can achieve economic and safety purposes.
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