Nematicidal activities of Tensy (Tanacetum polycephalum Schultz Bip. subsp. polycephalum) essential oil on Meloidogyne incognita and its chemical components
Essential oil from aerial parts of Tanacetum polycephalum Schultz Bip. subsp. polycephalum at the rates of 8000, 4000, 2000, 1000, 500, 250, 125, 62.5 and 0 mg l-1was tested for its nematicidal activity against the second stage juvenile (J2) of Meloidogyne incognita (Kofoid and White) Chitwood. 100 percent J2 mortality was achieved with essential oils of 8000 and 4000 mg l-1. Nematicidal activities were recorded as 44.4, 22.8 and 6 percentages for concentrations of 2000, 1000 and 500 mg l-1 respectively. No nematode mortality was seen in treatments of 250, 125, and 62.5 mg l-1of the oil. Analysis by Gas Chromatography (GC) and GC-Mass Spectrometry (GC-MS) led to identification of 39 major compounds from T. polycephalum oil. Among the chemical components, the main components were trans-Thujone (74.483%), 1,8-Cineole (3.135%), Terpinene-4-ol (2.316%), Borneol (2.351%), cis-Thujone (1.880%),Camphor (1.832%), trans-Pinocarveol (1.333%), and γ-Terpinene (1.059%).