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Summary Tetranychus turkestani  Ugarov and Nikolski is one of the main agricultural pests of southwestern Iran and some other tropical regions. In the present study, fumigant activity of three essential oils extracted from  Rosmarinus officinalis  L.,  Mentha longifolia  L. and  Eucalyptus globulus  Labill., and contact toxicity of two biopesticides (Tondexir and Palizin) on  T. turkestani  mite females were investigated and compared with that of spiromesifen, a chemical acaricide. Also, sublethal effects of the tested compounds at 50% lethal concentration (LC 50 ) were estimated on the biological parameters of  T. turkestani . The LC 50  values for  E .  globulus ,  R .  officinalis  and  M .  longifolia  essential oils were 12.50, 11.52 and 4.00 μl/l air and for spiromesifen, Tondexir and Palizin were 10.98, 327.34 and 858.13 ppm, respectively. All tested compounds significantly reduced adult female longevity, equally to the chemical acaricide spiromesifen. Fecundity also decreased in all treatments and this reduction was even higher for plant essential oils than the other compounds. Palizin,  E .  globulus  and  M .  longifolia  significantly reduced the hatchability of  T. turkestani  eggs similarly to spiromesifen. According to the results, the tested plant compounds are effective against  T. turkestani  and may be applied as suitable alternatives to synthetic pesticides against this crop pest.

Lethal and sublethal effects of several plant compounds compared to spiromesifen against Tetranychus turkestani