27 Ara 2024 Cuma
Fumigant toxicity of Carum copticum L. oil against Tribolium confusum du Val, Rhyzopertha dominica F. and Oryzaphilus surinamensis L.
Abstract :Plant secondary metabolites play an important role in the plant-insect interactions. Some compounds extracted from plants have insecticidal activity against insects. The chemical composition of the essential oil from seeds of Carum copticum grown in mashhad, Iran, was studied by gas chromatography mass spectrometry (GC-MS). Thymol (43%), ã-terpinen (15.85%) and â-cymene (21.67%) were found to be the major constituents of the oil. Fumigant toxicity test of above-mentioned plant essential oil against adults of Tribolium confusum du Val, Rhyzopertha dominica F. and Oryzaephilus surinamensis L. were carried out at 27±2°C and 60±5% RH. Results demonstrated that O. surinamensis (LC50 = 1.69 ìl/l air) was significantly more susceptible than R. dominica (LC50 = 19.01 ìl/l air) and T. confusum (LC50 = 58.70 ìl/l air) at 24 h length of exposure to this essential oil. In all cases, considerable differences were observed in mortality of insects with essential oil vapor in different concentrations and times. As expected, mortality was increased by increasing of doses and exposure time after 72 h fumigation
Carum copticum, Essential oil, Tribolium confusum, Rhyzopertha dominica, Oryzaephilus surinamensis, fumigant toxicity