Indiana Pesticide Applicator Core Practice Exam

Which type of pesticide is noted for having extreme inhalation danger?

1. Fumigants

2. Emulsifiable concentrates

3. Liquid flowables

4. Microencapsulates

The correct answer is: Fumigants

Fumigants are specifically designed to be volatile, which allows them to vaporize and disperse in the air, reaching pests that may be hidden in soil, structures, or stored products. This vaporization increases the risk of inhalation exposure for applicators and bystanders, making fumigants particularly hazardous in terms of inhalation danger. In contrast, emulsifiable concentrates, liquid flowables, and microencapsulates have properties that typically result in lower volatility and reduced inhalation risk. Emulsifiable concentrates tend to be used for surface applications and are less prone to vaporizing into the air compared to fumigants. Liquid flowables, while also liquid-based, usually have larger droplet sizes and a reduced propensity for inhalation exposure. Microencapsulates are designed to release their active ingredients slowly, further minimizing immediate inhalation risk. Therefore, fumigants stand out due to their high volatility and the associated inhalation hazard.