Which of the following is NOT an example of a sucking insect?

Grubs are larvae of certain beetles and are characterized by their root-feeding behavior rather than sucking plant juices. They primarily feed on grass roots and the roots of other plants, causing damage by disrupting the plant's nutrient and water uptake. Unlike sucking insects, which have specialized mouthparts for puncturing plant tissue and extracting fluids, grubs lack these adaptations.

In contrast, aphids, leafhoppers, and whiteflies are all examples of sucking insects, as they possess piercing-sucking mouthparts that allow them to draw sap from the plants they infest. This feeding method can lead to wilting, yellowing leaves, and other forms of damage as they remove essential nutrients from the plant. The unique feeding mechanisms of these groups define their roles as sucking insects, setting them apart from grubs.