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Abstract
The two-spotted spider mite, Tetranychus urticae Koch, one of the major pests of various agricultural plants, causes many problems with agricultural, horticultural and ornamental plants. In recent years, using plant-derived compounds such as essential oils and extracts were attended to their insecticidal and acaricidal properties. The galbanum, Ferula gummosa is a native plant of central Asia, was identified as an acaricide plant for the first time of this study. The composition of the essential oil was analyzed by GC-MS. The major components in the oil were β-pinene (50.1%), α- pinene (14.9%) and δ-3-Carene (6.7%). The impact on essential oil of this plant on fumigant toxicity, LT50, oviposition deterrent activity and repellency against T. urticae was studied at different concentrations. The results stated that F. gummosa oil had high toxicity on eggs and adults of two-spotted spider mite (LC50 was 6.98 and 6.52 μL L-1 for eggs and adults, respectively). In addition, all tested concentrations had oviposition deterrent activity and repellency on adults of this mite.