Efficiency of Some Plant Essential Oils Against the Two-Spotted Spider Mite, Tetranychus urticae Koch and the Two Predatory Mites Phytoseiulus persimilis )A.-H.), and Neoseiulus californicus (McGregor).

Elhalawany, Ashraf S.; Dewidar, Ahmed A.

doi:10.21608/eajb.2017.12101

Efficiency of Some Plant Essential Oils Against the Two-Spotted Spider Mite, Tetranychus urticae Koch and the Two Predatory Mites Phytoseiulus persimilis )A.-H.), and Neoseiulus californicus (McGregor).

Document Type : Original Article

Authors

¹ Fruit Trees Mites Department, Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt.

² Medicinal and Aromatic Plants Department, Horticultural Research Institute, Dokki, Agricultural Research Centre, Giza, Egypt.

10.21608/eajb.2017.12101

Abstract

Seven plant essential oils were tested for their toxicity against eggs and adults of Tetranychus urticae Koch as well as adults of the two predatory mites Phytoseiulus persimilis Athias-Henriot,Neoseiulus californicus (McGregor) under laboratory conditions. Essential oils were extracted with water distillation from lemon grass, spearmint, rosemary, marjoram herbs, fennel and coriander seeds and flower of chamomile, in five concentrations 4%, 3%, 2%, 1% and 0.5% were used for each essential oil. LC₅₀ values for the adult females after 72h of T. urticae were 1.28, 0.85, 0.53, 1.61, 0.44, 3.11 and 0.46%, respectively. For these oils, LC₅₀ values for eggs of T. urticae were 1.54, 6.44, 0.96, 1.72, 1.30, 14.67 and 0.95%, respectively. Chamomile, coriander, spearmint and rosemary proved to be the most efficient agent against eggs and adults of T. urticae. Results indicated that the mean number of laid eggs were highly decreased as concentration increased, the highest decreased was observed with T. urticae females treated with 4% conc. of coriander. It produced 4.7 eggs/female compared with 44.3 eggs/female in untreated females. On the other hand, there was no significant difference between seven essential oils against between P. persimilis and N. californicus after 48h. The LC₅₀ values of the seven oils ranged between 7.09 and 9.63% for P. persimilis, where it ranged from 4.94 to 9.63 for N. californicus. The toxicity of all essential oils was lower to females of predacious mites than T. urticae. The data may suggest that essential oils of all seven plants have potential to be used for management of T. urticae and a good selectivity on the two predacious mites P. persimilis and N. californicus.The chemical composition of the essential oils was characterized by GC.

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