Which is NOT a type of pest that poisonous bait formulations are used to control?

Poisonous bait formulations are specifically designed to attract and kill certain types of pests that ingest the bait, and they are commonly used for managing pest populations that are a direct threat to human health or property. The correct choice indicates a type of pest that typically does not respond to baiting strategies in the same manner as others.

Centipedes and millipedes are primarily non-target pests that do not feed on bait in the same way as rats, mice, ants, slugs, beetles, and cockroaches. Instead, they are more likely to feed on decaying organic matter or smaller insects. When targeting pests like rats and mice, baits are effective because these rodents are attracted to the food source and consume the bait, leading to their death. Similarly, insects such as ants and cockroaches are scavengers that are often attracted to baits that mimic their food sources.

In summary, centipedes and millipedes do not represent a group of pests where poisonous bait formulations are effective, as their feeding habits and ecological niches differ significantly from those of the more common pest categories that are typically controlled using such baits.