Physical property requirements insecticides

Violation of the physical property requirements of an agrochemical will lead to poor translation from laboratory to field conditions. The optimum physical property requirements for an agrochemical will differ widely depending on their specific application. How an agrochemical is applied, where it is applied and where it needs to translocate to Ae ultimate site of action will dictate the physical property constraints. We will list some of the physical property relationships that that have been published and how these principles can then be applied to the end use. These relationships can be applied to fangicidal, herbicidal and insecticidal applications. 

The specific use of an agrochemical will determine the physical property requirements. The failure of Agrochemicals in the translation from the laboratory to the field can often be traced to some barrier that needed to be traversed, that was not. We are going to ignore problems in the lack of translation due to such effects as photolysis, hydrolysis and oxidation. The optimum physical property requirements for compounds differ widely depending on their application. There has been proposed an agricultural rule of for commercial insecticides... 

Since pyrethroids show contact toxicity, the first requirement for insecticides is contact between pyrethroids and insects (flying, crawling). To achieve this, a physical property of pyrethroids, i.e., vapor pressure, is an important indicator. High vapor pressure is usually associated with excellent volatilization however, as the vapor pressures of individual pyrethroids are diverse due to different measurement methods and conditions (for example, temperature), it is difficult to capture the entire picture. 

The activity spectrum of a pesticidal compound is often determined by the physical properties of the compound. For example, systemic insecticides usually require both water and lipid solubility since it is necessary for them to pass through... 

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