What type of frass do Cerambycid pests commonly produce?

Cerambycid pests, commonly known as longhorn beetles, produce frass that is typically fine and light. This is primarily due to their feeding habits, as they primarily bore through wood. The frass they create is a combination of wood particles and excrement, which tends to be small and lightweight because the material they consume is mostly dry wood. The fine nature of the frass can often make it appear as though it is sawdust, which can accumulate around the exit holes created by the larvae.

The other types of frass described in the options, such as gritty and heavy, or liquid and sticky, don't accurately represent the characteristics of Cerambycid frass. Gritty frass might suggest a heavier composition more typical of other pest species, while liquid and sticky frass implies a different feeding behavior associated with other insects that produce more moisture-laden waste products, like certain soft-bodied insects. Pulverized and powdery might also mislead one into thinking of a different texture or weight that doesn't align with the light and fine characteristics of Cerambycid frass.