Efficacy of two plant oils and their mixture on two species of Tetranychus spp. (Acari : Tetranychidae)‎

الملخص EN

The biological effects of ginger oil (Zingiber officinale), castor oil (Ricinus communis) and their mixture were studied under laboratory conditions against adult female of carmine spider mite Tetranychus cinnabarinus (Boisduval) and the two spotted spider mite Tetranychus urticae Koch.

(Acari: Tetranychidae).

Also, LC50 of each treatment was established and the obtained results revealed that the mixture of ginger and castor essential oils was the most effective in the two species.

Ginger oil was more effective than castor oil which has very low effect on the two species.

LC50 was 322.54, 682.65 and 17305.99 ppm for the mixture, ginger oil and castor oil, respectively, for T.

cinnabarinus.

However, the LC50 was 429.71, 1517.39 and 23587 ppm for the mixture, ginger oil and castor oil, respectively, for T.

urticae.

The results indicated that, the essential plant oils were more effective on T.

cinnabarinus than T.

urticae.