Document Type : Agricultural Zoology
Authors
Abstract
Two-spotted spider mite Tetranychus urticae Koch is one of the most serious pests of crops in the world. Due to undesirable effects of synthetic pesticides, this research was conducted to achieve alternative safe compounds. In this research, lethal and sublethal effects of Cuminum cyminum and Eugenia caryophyllata essential oils on Tetranychus urticae were studied under laboratory conditions at 25± 1 °C, 65± 5 RH and a photoperiod of 16:8 (L:D) h. Fumigant toxicity at cumin (LC50= 3.74 ppm) was more than clove (LC50= 6.13 ppm) oil. Total pre-adult developmental time was significantly shorter when treated with Eugenia caryophyllata oil compared with control. Mean total fecundity (eggs/female) was ranged from 31.08 at treated with clove oil compare with 64.44 at control. The calculated net reproductive rate (R0) was 12.99 and 11.54 at treatment with cumin and clove oils respectively which were significantly shorter than control. The intrinsic rate of increase was 0.21 and 0.15 (offsprings/female/day) for control and treated populations with both essential oils, respectively. This study revealed that these essential oils may be suitable sources as alternatives for chemical pesticides.
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