When using dusters, how do pesticides act on insects?

The correct answer is that the dust coats and accumulates on insects. When pesticide dust is applied, it adheres to the exoskeleton of the insect. This physical action leads to the pesticide particles accumulating on the surface of the insect body. The active ingredients in the dust often work by disrupting physiological processes or damaging the insect's cuticle, which can lead to dehydration or direct toxicity.

Insect pests can be exposed to the pesticide dust through contact as they move over treated surfaces, where the dust can be picked up by their legs and body. The effectiveness of dust formulations is partly due to their ability to stick to insects and persist in the environment longer than liquid formulations, thereby allowing more opportunities for contact.

The other options represent processes that are less relevant or incorrect in explaining how pesticides act on insects. For instance, while it is true that inhalation could theoretically occur, it is not the primary means by which dust pesticides exert their effects. The reproductive aspect is also not directly applicable in most situations, as the dust's main mechanism is not about preventing reproduction but rather causing harm through contact. Additionally, the idea that dust evaporates before it contacts insects is misleading since dust formulations are designed to remain stable and not evaporate quickly, maximizing their