Insecticidal effect of two aqueous extracts from the leaves of Salvia officinalis and Eucalyptus camaldulensis against Aphis fabae

Study was conducted to test the effect of two aqueous extracts from the leaves of Salvia officinalis and Eucalyptus camaldulensis, on adults of the black bean aphid (Aphis fabae) under laboratory conditions. The insecticidal effect and the toxicity of the aqueous extracts on aphid mortality were evaluated by introducing the leaflets of the bean into an extract and infesting it by 10 adults of the aphid. Then do mortality rates count after 3, 6, 12 and 24 h. In addition, the repellant effect of aqueous extracts on bean aphids was estimated by placing the latter in the preferred position between two leaflets, each treated with a different extract. In addition, phytochemical screening was carried out to detect the presence of saponosides and tannins in the extracts studied. Through our study, the extract obtained from Eucalyptus camaldulensis at a concentration of 50% which is obtained by infusion was shown to be the most effective with a mortality rate of 93% after 12 h. As for the effect of these extracts on the orientation of the black bean aphid, these extracts give a remarkable repellent effect with a rate of 70% at a concentration of 50% on adults of the latter pest. On the other hand, Salvia officinalis extract has an acceptable rate by the maceration method. Regarding the phytochemical screening, we observed that the two plants contain the saponosides and the tannins.