Which of the following statements about a pesticide deposit is NOT true?

The assertion that a deposit is visible only after application is not true. In fact, the visibility of pesticide deposits can depend on various factors including the type of pesticide, the application method, the surface to which it's applied, and environmental conditions such as light and humidity.

Pesticide deposits are not solely defined by their visibility post-application; they can also refer to residues that exist on surfaces before they become visually apparent. Factors such as evaporation and breakdown over time can affect the visibility of the deposit. Understandably, deposits can sometimes be invisible right after application as they may be absorbed by surfaces or exist in concentrations too low to see.

Furthermore, it is crucial to recognize that pesticide deposits can vary widely in their visibility, meaning they might not always be easy to detect—even after application. The longevity of these deposits can also be substantial, remaining on surfaces for extended periods, potentially leading to implications for re-entry into treated areas and for pets and human safety. Therefore, understanding the nature and dynamics of pesticide deposits is essential for practical application and safety considerations in structural pest control.