Oklahoma Applicators License Core Practice Exam

Which environmental factors affect pesticide use outdoors?

1. Soil factors and rainfall

2. Humidity and crop type

3. Soil factors and wind

4. Temperature and pest species

The correct answer is: Soil factors and wind

The choice indicating that soil factors and wind affect pesticide use outdoors is accurate because both elements play significant roles in the application and efficacy of pesticides. Soil factors, such as texture and composition, influence how pesticides behave once applied. For instance, sandy soils may allow pesticides to leach deeper into the ground more readily than clay soils, which can retain pesticides longer. This can affect the overall effectiveness of the pesticide and the risk of environmental contamination. Additionally, the presence of organic matter in the soil can also alter the degradation rates of pesticides, impacting how long they remain active. Wind is another crucial variable when applying pesticides outdoors. It can significantly affect the drift of pesticide sprays, potentially leading to unintentional exposure of non-target areas. High winds can cause uneven distribution of the pesticide, making it less effective in the intended area while raising safety concerns for nearby plants, animals, and humans. Practicing proper wind management during application helps minimize risks and ensures that the pesticide does not drift away from the target site. In considering outdoor pesticide use, other factors such as humidity, temperature, and pest species also have their own impacts, but the combination of soil factors and wind is particularly critical in ensuring both effective pest control and environmental safety.