فهرست نشریات علمی دسترسی آزاد ایران

The insecticidal activity of extracts from Tabernaemontana sananho (local name: “fruta leche”) and Valeriana chaerophylloides (local name: “canutillo”) was evaluated against the cotton aphid, Aphis gossypii , to explore natural alternatives for its control. Ether-based (hexane) and hydroalcoholic extracts were prepared from dried (40 °C) and ground plant material at concentrations of 15, 25, and 35% v/v. Efficacy was assessed by a spray bioassay using 5 aphids per Petri dish and 3 replicates per treatment, with mortality recorded at 20, 40, and 60 min. Imidacloprid 2.5% was used as a positive control, and a blank as a negative control. At 60 min and 35% v/v, the ether extract of V. chaerophylloides produced the highest response (100.0% mortality), followed by the ether extract of T. sananho (93.4%). In contrast, the hydroalcoholic extracts showed lower mortality (13.4% for V. chaerophylloides and 40.0% for T. sananho ). Overall, the results highlight the promise of ether extracts, especially that of V. chaerophylloides , as candidates for botanical insecticide formulations, although additional studies are needed to confirm field performance and formulation stability.