Associate Certified Entomologist (ACE) Practice Exam

What type of pesticide formulation is used in inaccessible areas where sprays cannot reach?

1. Oils

2. Dusts

3. Aerosols

4. Emulsions

The correct answer is: Dusts

Dusts are particularly effective in inaccessible areas because they can penetrate cracks, crevices, and other hard-to-reach spaces where liquid sprays might not adequately reach or adhere. Their formulation allows them to remain in place longer, providing sustained pest control as they can be applied to areas such as wall voids, under appliances, or in attics and crawl spaces. Unlike oils, which may not remain stable or effective in deep recesses, or aerosols that can be difficult to apply in very small or confined spaces, dusts adhere to surfaces and are readily available for pests that come into contact with treated areas. Emulsions, while versatile, are typically designed for application in areas where they can create an even layer, which may not be suitable for inaccessible locations. Thus, dusts are the preferred choice for targeting these areas effectively.