BIOLOGICAL ACTIVITIES OF ESSENTIAL OILS FROM ANETHUM GRAVEOLENS L. AND ALLIUM SATIVUM L. FOR CONTROLLING TETRANYCHUS TRUNCATUS EHARA AND TETRANYCHUS URTICAE KOCH

The essential oils of Anethum graveolens L. and Allium sativum L. were investigated for the biological activities against Tetranychus urticae Koch and Tetranychus truncatus Ehara. The results indicated that A. sativum oil at 20% (v/v) had high contact toxicity (73.50% mortality) on adult females of T. truncatus. The LC50 value was 12.71% for 24 h after treatment. Eggs of both spider mites were also susceptible to 5-20% and 20% concentrations of A. sativum and A. graveolens oil, respectively. Allium sativum oil caused 97-100 and 84% mortality against T. truncatus and T. urticae eggs with LC50 values of 1.62 and 11.58% at 7 d after exposure, respectively. In repellency test, A. graveolens oil at 5-20% concentrations showed a high percentage of repellency on T. truncatus (62-96%) and T. urticae (98-100%) during 1-5 h after treatment. On the other hand, 5-20% and 15-20% concentrations of A. sativum oil appeared high percentage of repellency on T. truncatus (98-100%) and T. urticae (86-100%) during 1-5 h after treatment, respectively. In a fumigant toxicity test, A. sativum and A. graveolens oils were toxic to both spider mites. Allium sativum oil (LC50 = 4.94 µL/L in air) and A. graveolens oil (LC50 = 13.67 µL/L in air) were toxic to adult females of T. urticae whereas T. truncatus adult females were responsible to A. graveolens oil (LC50 = 5.24 µL/L in air) and A. sativum oil (LC50 = 5 µL/L in air). The results suggested that essential oils of A. sativum had potential for ovicidal activity on T. truncatus and T. urticae and acaricidal activity on T. truncatus. Both oils showed repellent activity against both spider mites. Oils of A. sativum and A. graveolens were toxic in fumigant effect on both spider mites. Their biological activities could be useful in promoting of integrated mite management.