Washington Pesticide Laws and Safety Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The selection indicating that temperature, humidity, and wind significantly impact pesticide effectiveness is correct because these environmental factors directly affect the behavior of pesticides when they are applied.

Temperature plays a crucial role in determining the volatility of pesticides, as higher temperatures can cause some pesticides to evaporate more quickly, reducing their effectiveness. Similarly, humidity levels influence how pesticides adhere to surfaces and can affect their degradation rates. Wind can also impact pesticide applications by causing drift, where the pesticide moves away from the target area, resulting in reduced effectiveness and potentially harming non-target species or the environment.

Other options, such as soil type and pH, as well as application method and timing, are also important in their contexts. Soil type and pH can affect the absorption and mobility of pesticides in the ground, while the method and timing of application influence when and how effectively a pesticide can target its intended pests. However, the specific factors identified in the correct choice directly influence the immediate effectiveness of a pesticide at the time of application and are thus critical to consider during pesticide use.