Indiana Pesticide Applicator Core Practice Exam

Which factors contribute to spray and vapor drift of pesticides?

1. Slope of land and soil moisture content

2. Air temperature and humidity levels

3. Presence of vegetation and pesticide type

4. All of the above

The correct answer is: All of the above

The correct answer encompasses a variety of factors, all of which can significantly influence the spray and vapor drift of pesticides. The slope of the land and soil moisture content can affect how pesticides are applied and how they behave in the environment. Steeper slopes can lead to increased runoff, while moisture levels in the soil can impact the absorption of pesticides, potentially leading to more chemicals being available to drift. Air temperature and humidity levels are critical meteorological factors that influence drift. Higher temperatures can increase the volatility of certain pesticide formulations, leading them to evaporate and drift more readily. Conversely, low humidity can enhance this effect, making it easier for vapor drift to occur. The presence of vegetation can also play a role; dense foliage may intercept pesticide particles, reducing drift, while certain types of vegetation might provide a barrier or funnel spray particles, influencing their movement. Additionally, the type of pesticide used—its formulation, volatility, and intended application method—affects how prone it is to drift. By encompassing all of these elements, one can see how each factor interplays and contributes to the overall risk of spray and vapor drift, making the answer that includes all factors the most comprehensive choice.