Effects of Ocimum basilicum and Ruta chalepensis hydrosols on Aphis gossypii and Tetranychus urticae

Abstract

Hydrosols are by‐products derived during the extraction of essential oils and are produced in a high amount and at very low cost. Their effects on crop pests have been little studied, although recent studies have shown their insecticidal properties. In this work, the effects of hydrosols derived from Ocimum basilicum (sweet basil) and Ruta chalepensis (rue) were investigated on the serious crop pests Aphis gossypii and Tetranychus urticae. The main compounds of basil hydrosol were linalool (66.5%), eugenol (18.9%) and eucalyptol (7.1%), while rue's were 2‐nonanone and 2‐undecanone at 77.0% and 8.9%, respectively. The mortality and fecundity of A. gossypii and T. urticae were recorded for 7 days after application of hydrosols. Apterous adult aphids and female mites were sprayed on cucumber leaves in special structures. Both hydrosols caused significant mortality rates, which fluctuated between 46.0% and 64.0%. The negative control (deionized water) caused no mortality, while for the positive controls (synthetic pesticides) was 100%. The fecundity of A. gossypii and T. urticae was significantly reduced after the application of the hydrosols (17.1 nymphs of A. gossypii and 22.8 eggs for T. urticae had been produced per female after treated with the hydrosol of R. chalepensis and O. basilicum, in comparison with 41.6 and 49.5 in the negative controls, respectively). In conclusion, the hydrosols from both plants presented an important effect on the mortality and fecundity of both pests.

A laboratory study of the acaricidal, repellent and oviposition deterrent effects of three botanical oils on Tetranychus urticae (Koch, 1836) (Acari: Tetranychidae)

“…With the similar results, the acaricidal effects of different formulations containing neem on T. urticae have also reported by numerous researchers (Sundaram & Sloane, 1995;Martínez-Villar et al, 2005;Pavela, 2009;Deka et al, 2011;Tehri & Gulati, 2014). In the present study, 9.6% basil oil killed 90% of the females within 100-121 h. Similarly, some researchers found that essential oils extracted from different cultivars of the basil had acute toxicity to T. urticae under greenhouse conditions (Refaat & Momen, 2002;Mateeva et al, 2003;Aslan et al, 2004;Pavela et al, 2016;Traka et al, 2018). Refaat & Momen (2002) reported that 0.5 and 2% basil oil effected T. urticae survival with rates of 80-100%.…”

“…Refaat & Momen (2002) reported that 0.5 and 2% basil oil effected T. urticae survival with rates of 80-100%. The main compounds contributing to significant mortality of T. urticae were determined to be linalool (66.5%), eugenol (18.9%) and eucalyptol (7.1%) (Traka et al, 2018).…”

Evaluate the plant extracts of Syzygium aromaticum, Citrulus colocynthis and Jatropha curcas against Tetranychus urticae Koch (Acari: Tetranychidae) on Cucumis satives

“…They explain that, among the plant oils tested, karanja and mahogany oils were found most effective against T. urticae and both the oils showed significantly better performance compared to all other treatments. Although , Traka, et al (2018) investigated the effects of hydrosols derived from Ocimum basilicum (sweet basil) and Ruta chalepensis (rue) on the serious crop pests Aphis gossypii and Tetranychus urticae. They found both hydrosols caused significant mortality rates, which fluctuated between 46.0% and 64.0%.…”

The Use of Essential Oil and Hydrosol Extracted from Satureja hellenica for the Control of Meloidogyne incognita and M. javanica

“…Hydrosols derived from three Lamiaceae species showed an important adverse effect on the settling behavior of Myzus persicae [12]. Traka et al [13] reported that hydrosols derived from Ocinum basilicum and Ruta chalepensis presented an important effect on the mortality of Aphis gossypii and Tetranychus urticae. Terpenes constituent of EOs are responsible for the characteristic aroma and odor of each plant, because of the volatile compounds that they contain.…”