بررسی اثر دو کنه کش اتوکسازول و جی سی مایت بر کنه دو نقطه ای Tetranychus urticae و کنه شکارگر Amblyseius swirskii

The two-spotted spider mite, Tetranychus urticae Koch is an important species worldwide and is considered a key pest in many crops. Nymphs and adults of the mite feed with chelicerate type of mouthparts which pierce and suck the cell sap from epidermis of leaves. The control of this pest has been mainly based on the use of acaricides. Phytoseiid mites are used mostly for biological control of pest mites. This study was conducted to evaluate bio-efficacy of two pesticides against all biological stages of spider mite Tetranychus urticae Koch (Tetranychidae) and predatory mite, Amblyseius swirskii Athias-Henriot ( Mesostigmata: Phytoseiidae) under greenhouse conditions at 27°C, 70 ± 5% RH and 16L: 8D h. of photoperiod. LC50 and LC90 values of Etoxazole on adult female of T. urticae were 1.04 and 1.63, respectively, for eggs 0.78, 1.27 and for deutonymph 0.95, 1.48. LC50 and LC90 values of GC-mite on adult female of T. urticae were 2.29, 2.89 and on eggs 1.91, 2.32 and deutonymph 2.01, 2.73. The LC50 and LC90 values of etoxazole on adult female of A. swirskii were 2.1, 2.88, for eggs 1.66, 2.23, and for deutonymph 1.72, 2.36 and GC-mite on adult female 2.41, 2.84, for eggs 1.40, 1.99, for deutonymph 1.58, 2.12. The results showed that both of tested acaricides showed a good potential for controlling the pest, but etoxasole was very effective especially in controlling eggs and immature stages of spider mites T. urticae while had minimal effect on A. swirskii. The results of this study suggest that etoxasole can be used as a selective acaricide in an integrated pest management program.