Chemical composition, antimicrobial and insecticidal activities of the essential oils of <i>Conyza linifolia</i> and <i>Chenopodium ambrosioides</i>

<div><p>Two essential oil-containing plants growing wildly in Egypt: <i>Conyza linifolia</i> (Willd.) Täckh. (Asteraceae) and <i>Chenopodium ambrosioides</i> L. (Chenopodiaceae) were subjected to essential oil analysis and biological investigation. The essential oils from both plants were prepared by hydrodistillation, and GC/MS was employed for volatiles profiling. This study is the first to perform GC/MS analysis of <i>C. linifolia</i> essential oil growing in Egypt. <i>C. linifolia</i> essential oil contained mainly sesquiterpenes, while that of <i>C. ambrosioides</i> was rich in monoterpenes. Ascaridole, previously identified as the major component of the latter, was found at much lower levels. In addition, the oils were investigated for their antimicrobial activity against two Gram positive and two Gram negative bacteria, and one fungus. The insecticidal activities of both oils, including mosquitocidal and pesticidal potentials, were also evaluated. The results of biological activities encourage further investigation of the two oils as antimicrobial and insecticidal agents of natural origin.</p>