Most white grub pests in turf are introduced species. Why are introduced pests generally more damaging than native insects?

• A. They reproduce faster
• B. Because introduced pest species do not have the complement of parasites and predators that keep the insect population in check in its native range
• C. They are larger
• D. They are more cold-tolerant

Answer: (B)

When a pest is introduced to a new area, it often escapes the natural enemies that kept it in check in its native range. Parasites, predators, and diseases that normally suppress its population are absent or ineffective, allowing the pest to reach much higher numbers. In turf, that means more grubs feeding on roots and causing greater damage. Reproducing faster, being larger, or being more cold-tolerant aren’t universal traits that explain why introduced pests are typically more damaging; the key factor is the lack of natural enemies that would normally keep their populations in balance.