Contact Toxicity, Antifeedant Activity, and Oviposition Preference of Osthole against Agricultural Pests.

Osthole, the dominant bioactive constituent in the , has shown acute pesticidal activities. However, its detailed toxicity, antifeedant, and oviposition preference effects against agricultural pests have not been fully understood, limiting its practical use. This study aimed to investigate the contact toxicity, antifeedant activity, and oviposition preference of osthole against three agricultural pests (, , and ).