Akademik Veri Yönetim Sistemi
FRESENIUS ENVIRONMENTAL BULLETIN, cilt.16, sa.11B, ss.1498-1502, 2007 (SCI-Expanded)
The fumigant toxic and oviposition-deterring activities of three essential oils, laurel (Laurus nobilis L.), myrtle (Myrtus communis L.) and wormwood (Artemisia absinthum L.), were studied against the carmine spider mite, Tetranychus cinnabarinus (Boisd.) (Acarina: Tetranychidae), under laboratory conditions. All three essential oils were toxic to adults and eggs of the mite, but to variable degrees. After an exposure period of 12 h, laurel oil showed the strongest toxicity against adults (LD50 1.41 mu l/L air), followed by myrtle (LD50 = 2.80 mu l/L air). Although wormwood oil was the least toxic against adults (LD50 = 5.77 mu l/L air), it exhibited higher toxicity against eggs of the mite (LD50 = 3.81 mu l/L air) than myrtle (LD50 = 8.38 mu l/L air) or laurel oil (LD50 = 10.23 mu l/L air). In the ovipositional assays, all essential oils were found to deter T. cinnabarinus females from laying eggs in a dose-dependent manner. Wormwood oil was more potent than the others, and exhibited 100% oviposition deterrency against adult females of the mite at the highest concentration (0.5%) during a 4-day period. The oviposition deterrency (o.d. %) of wormwood oil ranged between 62.65-100% for females of the mite, at different concentrations ranging from 0.0625 to 0.5%. The results indicate that the test essential oils may have utility in protecting greenhouse crops from spider mites.