How does a stomach insecticide differ from a contact insecticide?

Stomach insecticides specifically target pests when they consume the pesticide during feeding. These insecticides work by being ingested and then acting on the insect's digestive system, disrupting its normal physiological functions and ultimately leading to death. This method of action is effective because the insect is actively taking in the pesticide as part of its diet.

In contrast, contact insecticides function through direct contact with the insect's body, which makes them effective upon application to surfaces where insects may walk or land. Since stomach insecticides rely on ingestion, they are not effective on insects that do not eat the treated material.

Understanding the mechanism of stomach insecticides is crucial for proper pest management practices, ensuring that the chosen method aligns with the pest's behavior and biology. This is why the statement about stomach insecticides being ingested while feeding accurately describes how they differ from contact insecticides.