Acaricidal activity of fenugreek and parsley oils against Tetranychus urticae (Acari: Tetranychidae)
Shimaa F Fahim
The two-spotted spider mite, Tetranychus urticae Koch, is a key pest of numerous plants worldwide. The acaricidal and oviposition deterrence activity of fenugreek and parsley oils against T. urticae were evaluated in the present study. In addition, the sublethal effects of these oils on female longevity, fecundity and sex ratio of progeny of T. urticae were also assessed. Fenugreek and parsley oils showed acaricidal activity against eggs and females of T. urticae. However, T. urticae females were more susceptible to fenugreek oil (LC50 = 0.562and LC90 = 1.659%) as compared to parsley oil (LC50 = 1.011and LC90 = 2.739%). Herein, both tested oils showed oviposition deterrence activity against T. urticae. When T. urticae females were treated with LC25 of fenugreek and parsley oils, the female laid 0.95 and 1.22 eggs/day, respectively as compared to 4.63 eggs/day for the control female. However, female laid 0.76 and 0.89 eggs/day when treated with the higher tested concentration of the abovementioned oils, respectively. The longevity of T. urticae females treated with LC50 of fenugreek (10.60 days) and parsley oils (12.25 days) was shorter than that of control females (16.00 days). The sex ratio (♀ %) of the progeny produced by T. urticae females treated with tested oils was lower than that of the control. The present results suggested that fenugreek and parsley oils may be promising tools in the control programs of T. urticae.