Acaricidal effect of some formulated compositions based on cinabery extract and herbal essential oils on the two-spotted spider mite (Tetranychus urticae)

The two-spotted spider mite، Tetranychus urticae Koch، is one of the most common and dangerous pests for agricultural crops worldwide. Frequent pesticide applications have caused development of resistance to pesticides، undesirable effects on non-target organisms and environmental pollutions. Plant essential oils have recently attracted particular attention as alternative agents of chemical pesticides because of lower risks for human and mammals، rapid biodegradation and less environmental hazards. In this study، contact toxicity of nineformulated compositions based on herbal essential oils including rosemary، pennyroyal، peppermint and cinnamon essential oils plus fruit extract of chinaberry by leaf dipping method were tested against female adultsof T. urticae. Experiments were carried out at 25±1°C، 70±5% RH and under a photoperiod of 16L: 8D. Results showed that formulated composition based on fruit extract of chinaberry and rosemary and peppermint oils (chinaberry 5% + peppermint 2%+rosemary 2%) significantly had the highest lethal effect and lowest LC50 and LC90 values (3. 399 and 10. 102 ml/l، respectively) 24 h. after treatment، against the adults of T. urticae، indicating significant potential for two-spotted spider mite management.