What tools are categorized as hand dusters?

Hand dusters are tools specifically designed for applying pesticide dust in a controlled and efficient manner. They are particularly useful for targeting hard-to-reach areas where pests tend to hide, such as cracks, crevices, and voids in structures.

The choice highlighting bulb, bellows, and plungers refers to specific types of hand dusters that work by creating airflow to disperse dust formulations. Bulb dusters utilize a squeeze bulb mechanism to blow air and dust out, while bellows dusters operate through a more traditional squeeze-and-release method, and plungers often involve a pushing action to release dust.

In contrast, the other selections do not represent hand dusters. Brushes and sprays involve different application methods; brushes are for physical removal or application, while sprays utilize liquid formulations. Foam, gels, and liquids expand pesticide delivery beyond dust, focusing on different formulations altogether. Lastly, pops, spikes, and snares align more with physical pest management methods rather than dust application techniques.

Thus, the tools categorized as hand dusters specifically serve the purpose of dust application, making the first option the correct answer.