Texas Pesticide Applicator Practice Exam

Why are dust formulations rarely used outdoors?

1. They are less effective than liquids

2. They may drift away from the target area

3. They are difficult to apply

4. They are very expensive

The correct answer is: They may drift away from the target area

Dust formulations are rarely used outdoors primarily because they have a tendency to drift away from the target area. This characteristic can lead to unintentional exposure and contamination of non-target organisms, including beneficial insects, plants, and even water sources. The fine particles in dust are more susceptible to environmental factors such as wind, which can carry them away from where they are applied. This drift not only reduces the effectiveness of the treatment by preventing it from reaching the intended pests but also raises safety concerns regarding the pesticide's impact on surrounding areas. In contrast, liquid formulations are often more controlled during application and can adhere better to surfaces, helping minimize drift and improve effectiveness for pest control. Dusts may also face challenges in targeting pests that are hiding in cracks and crevices, making them less preferred in outdoor environments where wind and other factors can play a significant role in their performance and safety.